The Songnen Plain in Northeast China is an important base of cash grain and soybean in China. Nonpoint source nutrient loads (TN, TP, NH3-N, NO3--N, PO43--P) to the water bodies were estimated using 137Cs nuclear tracing technique and field monitoring method. The annual mean erosion thickness of black soil in the typical slops is within 0.120-0.525 cm, and the erosion intensity is 1355.0-7558.2 t/km2 in last 40 years. The annual mean values of pollution loads per square kilometer were TN 1.43 t, NH3-N 15.01 t, NO3--N 8.51 t, TP 0.42 t, PO43--P1.85 t, respectively. Water dissolved inorganic nitrogen and phosphorus accounted for 0.51% of total nitrogen, and 0.12% of total phosphorus. Caesium-137trating technique is an differentive to traditional methods.
YANG Yu-hong, YAN Bai-xing, SHEN Bo, CAO Hui-cong
. Agricultural Nonpoint Source Pollution Loads Prediction Using Caesium-137 Tracing Technique in Black Soil Region, Northeast China[J]. SCIENTIA GEOGRAPHICA SINICA, 2010
, 30(1)
: 124
-128
.
DOI: 10.13249/j.cnki.sgs.2010.01.124
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