不同林龄华北落叶松人工林地土壤肥力评价  

Assessment of Soil Fertility in Different Aged Larix principis-rupprechtii Plantation

作　　者：王玲玲[1] 徐福利[2] 王渭玲[1] 赵海燕[3] 孙鹏跃 白小芳[2] 

机构地区：[1]西北农林科技大学生命科学学院,陕西杨凌712100 [2]中国科学院水利部水土保持研究所,陕西杨凌712100 [3]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《西南林业大学学报（自然科学）》2016年第2期17-24,共8页Journal of Southwest Forestry University：Natural Sciences

基　　金："十二五"国家重点基础研究发展计划项目(2012CB416902)资助

摘　　要：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 - ruppre- chtii 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 car- bon, total nitrogen, nitrate nitrogen, ammonium nitrogen, available phosphorus, available potassium, acid phos- phatase, urease and invertase. The value of available phosphorus was the smallest, the number was O. 14, and the ammonium nitrogen and urease took the second place, the number was 0.26. On the contrary, the membership val- ue 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 phos- phorus on the growth of Larix principis-rupprechtii will increasingly prominent.

关 键 词：华北落叶松 人工林 土壤肥力评价 主成分分析 隶属度函数 

分 类 号：S714.8[农业科学—林学]