水保所知识产出(1956---)知识库

运用主成分分析与Norm 值、隶属度函数结合的方法，分析评价秦岭地区不同林龄( 5、10 和
20 年生) 华北落叶松人工林土壤肥力的大小。结果表明: 土壤有机碳、全氮、硝态氮、铵态氮、速效
磷、速效钾、酸性磷酸酶、脲酶、蔗糖酶组成了土壤质量评价的最小数据集; 速效磷隶属度数值最小，
为0. 14，铵态氮、脲酶次之，为0. 26，速效钾与蔗糖酶的隶属度数值最大，分别为0. 75、0. 74; 不同林
龄土壤综合质量指数数值为0. 43 ～ 0. 57，随着林龄的增加，土壤肥力呈现降低的趋势，即
5a ＞ 10a ＞ 20a; 华北落叶松人工林样地磷元素的消耗速率＞ 氮元素，消耗速率分别为9. 94%、
1. 11%，磷在华北落叶松生长中的限制作用会日益凸显。

The level of soil fertility of different aged( 5 － ，10 － ，and 20 － year － old) Larix principis － rupprechtii
plantation was assessed by using the method of principal component analysis，Norm value and membership
function of fuzzy mathematic． The study found that the minimum data set of soil assessment comprises organic carbon，
total nitrogen，nitrate nitrogen，ammonium nitrogen，available phosphorus，available potassium，acid phosphatase，
urease and invertase． The value of available phosphorus was the smallest，the number was 0. 14，and the
ammonium nitrogen and urease took the second place，the number was 0. 26． On the contrary，the membership value
of available potassium and sucrose were maximal，reach to 0. 75 and 0. 74，respectively; In different aged Larix
principis － rupprechtii plantation，the value of soil comprehensive quality index fall in between 0. 43 and 0. 57． Soil
fertility showed a declining trend with age，the sequence is 5a ＞ 10a ＞ 20a; The consumption rate of phosphorus
was more quickly than that of nitrogen，the rate was 9. 94% and 1. 11% respectively，so the restriction of phosphorus
on the growth of Larix principis-rupprechtii will increasingly prominent．