冀北山地华北落叶松人工林与杨桦次生林的土壤养分差异  

Difference of Larix principis-rupprechtii plantations and secondary poplar-birch forests in soil nutrients in Northern Yanshan Mountain

作　　者：李晓莎[1] 李倩茹[1,2] 许中旗[1] 贾彦龙[1,2] 庞瑞[1] LI Xiaosha LI Qianru XU Zhongqi JIA Yanlong PANG Rui(College of Forestry, Hebei Agricultural University, Baoding 071000, Hebei, China Institute of Geographic Sciences and Natural Resources Research, Beijing 100101, China)

机构地区：[1]河北农业大学林学院,河北保定071000 [2]中国科学院地理科学与资源研究所,北京100101

出　　处：《中南林业科技大学学报》2017年第9期20-26,共7页Journal of Central South University of Forestry & Technology

基　　金：国家林业公益性行业科研专项(20100400205);河北省高层次人才资助项目(B2014010001)

摘　　要：为了了解冀北山地华北落叶松人工林对土壤肥力的影响,采用野外调查和室内分析相结合的方法,研究了当地华北落叶松人工林(9、18、33 a)和杨桦天然次生林(9、18、28 a)2种林型下的土壤养分状况。结果表明:(1)2种林型土壤有机质及氮的差异在不同的林龄阶段表现出不同的特点,总体上幼龄和中龄阶段,华北落叶松人工林高于杨桦天然次生林,而近熟林则相反;在多数年龄阶段的多数土层中,华北落叶松人工林土壤磷元素含量高于杨桦天然次生林;除近熟林0~40 cm土层土壤全钾略低于杨桦天然次生林外,华北落叶松人工林其他年龄及土层的速效钾及全钾含量均高于杨桦天然次生林。(2)在各种养分的垂直分布上,2种林型的有机质、氮、速效钾均随土层深度的增加而呈下降的趋势,全钾及全磷下降趋势不明显,或只有较小下降幅度;同时,华北落叶松人工林有效磷含量在垂直方向上存在先下降后上升的趋势。(3)总体上,从2种林型3个年龄段土壤养分含量的比较来看,华北落叶松人工林的营造并未导致土壤出现明显的衰退。In order to understand how Larix principis-rupprechtii plantations influence soil fertilities in Northern Yanshan Mountain, We adopted the method of combining field investigation and laboratory analysis to analyze the soil nutrient contents in two kinds of forests, including Larix principis-rupprechtii plantations and secondary poplar-birch forests with different ages. The results showed that the difference of soil organic matter and nitrogen content for two forest types with different ages show different characteristics. Overall, Larix principis-rupprechtii plantations in young and middle age stage are higher than secondary poplar-birch forests, while nearly mature age is the opposite; the phosphorus content show a trend that Larch plantations is higher than secondary poplar-birch forests in the most of soil layer and age groups; only the soil layer of 0~40 cm in the near mature forest show that the total kalium of Larch plantations is lower than secondary poplar-birch forests, all other age groups and soil layer show that the available kalium and the total kalium of Larch plantations is higher than secondary poplar-birch forests. On the vertical distribution of various nutrients, the organic matter, nitrogen and available kalium of two kinds of forest stand gradually decreased with the increase of soil depth, the total kalium and total phosphorus decline is not obvious, or decline to a lesser extent; at the same time, the content of available phosphorus of Larch plantations was first increased and then decreased in vertical direction, On the whole, from the perspective of soil nutrient content of two forest types in three ages, the soil of Larixprincipis-rupprechtii plantations compared with secondary poplar-birch forests did not show obvious recession.

关 键 词：华北落叶松 人工林 天然次生林 土壤养分 

分 类 号：S714.8[农业科学—林学]