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result sql = [Study on spatial variability of soil salinity based on spectral indices and EM38 readings].
[Study on spatial variability of soil salinity based on spectral indices and EM38 readings].
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char = o;code = 111
char = d;code = 100
char = e;code = 101
char = l;code = 108
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = R;code = 82
char = e;code = 101
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = y;code = 121
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 2;code = 50
char = 5;code = 53
char = 9;code = 57
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 5;code = 53
char = 7;code = 55
char = 2;code = 50
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = h;code = 104
char = i;code = 105
char = b;code = 98
char = i;code = 105
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = d;code = 100
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = v;code = 118
char = a;code = 97
char = r;code = 114
char = i;code = 105
char = a;code = 97
char = b;code = 98
char = i;code = 105
char = l;code = 108
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = o;code = 111
char = w;code = 119
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = p;code = 112
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = f;code = 102
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = o;code = 111
char = r;code = 114
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = S;code = 83
char = p;code = 112
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = b;code = 98
char = u;code = 117
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = p;code = 112
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = b;code = 98
char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = p;code = 112
char = p;code = 112
char = l;code = 108
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = x;code = 120
char = ,;code = 44
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = x;code = 120
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = E;code = 69
char = M;code = 77
char = 3;code = 51
char = 8;code = 56
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = m;code = 109
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = I;code = 73
char = t;code = 116
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = z;code = 122
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ,;code = 44
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = u;code = 117
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = ,;code = 44
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = h;code = 104
char = i;code = 105
char = b;code = 98
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = b;code = 98
char = v;code = 118
char = i;code = 105
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = e;code = 101
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = .;code = 46
char = ;code = 32
char = S;code = 83
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = f;code = 102
char = a;code = 97
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = y;code = 121
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = e;code = 101
char = p;code = 112
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = y;code = 121
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = o;code = 111
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = f;code = 102
char = i;code = 105
char = l;code = 108
char = e;code = 101
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = y;code = 121
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = i;code = 105
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = 4;code = 52
char = 0;code = 48
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = i;code = 105
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = o;code = 111
char = o;code = 111
char = t;code = 116
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = q;code = 113
char = u;code = 117
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = r;code = 114
char = r;code = 114
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = (;code = 40
char = R;code = 82
char = M;code = 77
char = S;code = 83
char = E;code = 69
char = );code = 41
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = b;code = 98
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = y;code = 121
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 9;code = 57
char = 4;code = 52
char = ,;code = 44
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 5;code = 53
char = 2;code = 50
char = ,;code = 44
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 7;code = 55
char = 1;code = 49
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 6;code = 54
char = 7;code = 55
char = ;code = 32
char = d;code = 100
char = s;code = 115
char = ;code = 32
char = x;code = 120
char = ;code = 32
char = m;code = 109
char = (;code = 40
char = -;code = 45
char = 1;code = 49
char = );code = 41
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = ,;code = 44
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = s;code = 115
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = a;code = 97
char = l;code = 108
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = d;code = 100
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = R;code = 82
char = M;code = 77
char = S;code = 83
char = E;code = 69
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = i;code = 105
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = f;code = 102
char = i;code = 105
char = l;code = 108
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char = ;code = 32
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char = n;code = 110
char = i;code = 105
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result sql = Taking Feng-qiu County as a case of soil salinization widely existing in the semiarid region, the spatial variability of soil salinity was investigated by using remote sensing and EM (electromagnetic induction) technologies in the present study. Descriptive statistics was applied to soil salinity data interpreted from EM38 measurements using field sampling method. Spectral indices (soil index and plant index) were derived from 25-resolution Landsat TM image taken in April 2005, and proved to be significantly correlated with soil salinity interpreted by EM38 readings. Regression models were further established between the interpreted soil electrical conductivity and spectral indices (soil index and plant index), and'spatial distribution patterns across the study area were finally mapped based on the above regression models. Results indicated that soil salinity at each soil layer is from 0.259 to 0.572 and exhibits the moderate spatial variability owing to compound impact of intrinsic and extrinsic factors. Spatial distribution maps of soil salinity were obtained with the application of plant index, soil index and EM38 measurements. It was shown that soil salinization, mainly located in the north and south of the study area, exhibited obvious trend effect. Salinity at surface soil was the greatest and showed the trend of a decrease at subsoil layer and then an increase at deep layer in the whole soil profile. The accuracy of the predictions was tested using 40 soil sampled points. The root mean square error (RMSE) of calibration for soil salinity in each layer was 0.094, 0.052, 0.071 and 0.067 ds x m(-1) respectively, showing that the precision is ideal. The change trends of RMSE were the same as soil salinity in soil profile. The trends indicated that soil salinity had effect on the salinity prediction by spectral indices, and showed better accuracy at low soil salinity.

Publication: Guang Pu Xue Yu Guang Pu Fen Xi 2009 Apr ;29(4)::1023-7.
Publication Date: 2009 Apr
Study Author(s): Wu, Ya-kun;Yang, Jin-song;Li, Xiao-ming;
Institution: Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. [email protected]
Shortcut link to this study:
Taking Feng-qiu County as a case of soil salinization widely existing in the semiarid region, the spatial variability of soil salinity was investigated by using remote sensing and EM (electromagnetic induction) technologies in the present study. Descriptive statistics was applied to soil salinity data interpreted from EM38 measurements using field sampling method. Spectral indices (soil index and plant index) were derived from 25-resolution Landsat TM image taken in April 2005, and proved to be significantly correlated with soil salinity interpreted by EM38 readings. Regression models were further established between the interpreted soil electrical conductivity and spectral indices (soil index and plant index), and'spatial distribution patterns across the study area were finally mapped based on the above regression models. Results indicated that soil salinity at each soil layer is from 0.259 to 0.572 and exhibits the moderate spatial variability owing to compound impact of intrinsic and extrinsic factors. Spatial distribution maps of soil salinity were obtained with the application of plant index, soil index and EM38 measurements. It was shown that soil salinization, mainly located in the north and south of the study area, exhibited obvious trend effect. Salinity at surface soil was the greatest and showed the trend of a decrease at subsoil layer and then an increase at deep layer in the whole soil profile. The accuracy of the predictions was tested using 40 soil sampled points. The root mean square error (RMSE) of calibration for soil salinity in each layer was 0.094, 0.052, 0.071 and 0.067 ds x m(-1) respectively, showing that the precision is ideal. The change trends of RMSE were the same as soil salinity in soil profile. The trends indicated that soil salinity had effect on the salinity prediction by spectral indices, and showed better accuracy at low soil salinity.
PMID: 19626895

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