海河流域土壤中氮的库存量与流通量研究

INVENTORY AND FLUXES OF NITROGEN IN SOIL IN THE HAIHE RIVER BASIN

本文通过对海河流域土壤中氮及其形态含量的研究分析结果，得出该流域土壤中氮的库存量为５．９６×１０￣（１０）ｋｇ。以成土母质、人畜粪、化肥施入量和径流带入量，大气降尘及植物的残留量等作为对土壤中氮的输入因子，同时以径流的带出，大气的扬尘量及植物体茎、叶作为氮的迁出因子，得到海河流域土体中氮的进出量分别为４．０２×１０￣９ｋｇ／ａ和３．４６×１０￣９ｋｇ／ａ，研究了土壤中氮输入与输出的流通关系。

he inventory of nitrogen in soil in the Haihe River Basin was estimated at 5.96 × 10￣(10)kg, based on the analytical results available for each of the possible species of nitrogen pre-sent.The input rate of nitrogen into the river basin was estimated at 4. 02 × 10￣9kg/a,in-cluding those from the parental materials of soil,the excrement of humanbody and animal,other living things,application of chemical fertilizers,inflow by run-off,air deposit and plantresidues as the sources of nitrogen in soils.The output rate of nitrogen from the river basinwas estimated at 3.46 × 10￣9kg,including those brought away from soils by run-off,dustblowing,plant uptake and others.