晋西黄土区水土保持林地的土壤水分和养分特征  

Soil moisture and nutrient characteristics of soil and water conservation forests in Loess Plateau of western Shanxi Province

作　　者：田宁宁[1] 张建军[1] 茹豪[1] 李玉婷[1] 丁杨[1] 张艳婷[1] 

机构地区：[1]北京林业大学水土保持学院,北京100083

出　　处：《中国水土保持科学》2015年第6期61-67,共7页Science of Soil and Water Conservation

基　　金：国家林业公益性行业科研专项经费"天然林保护等林业工程生态效益评价研究"(201304308)

摘　　要：为了探讨水土保持林地的土壤水分和养分特征,以晋西黄土区油松林地、刺槐林地、次生林地3种水土保持林地为研究对象,采用Enviro SMART土壤水分定位监测系统对各林地的土壤水分进行监测,并对土壤养分和根系密度进行调查。结果表明：1）3种林地0-150 cm土层平均含水量的由大到小排序为次生林地〉油松林地〉刺槐林地;2）次生林地和刺槐林地土壤水分的月动态变化整体趋势一致,但次生林地土壤含水量大于刺槐林地,油松林地土壤水分的月动态变化比其他2种林地波动剧烈;3）3种林地0-30 cm土层根系密度的大小关系为次生林地〉刺槐林地〉油松林地,根系密度随土层深度的增加而减小;4）3种林地0-30 cm土层的根系密度与土壤含水量呈显著负相关性;5）次生林地0-30 cm土层内有机质、全磷、全钾质量分数均明显高于油松林地和刺槐林地,油松林地和刺槐林地相差不大;6）3种林地有机质和全钾质量分数均随土层深度的增加而减少,全磷质量分数随土层深度的增加变化不明显。In order to explore soil moisture and nutrient characteristics of soil and water conservation forests,we investigated soil moisture,soil nutrients and root density of three types of forests,i. e.,Pinus tabulaeformis plantation,Robinia pseudoacacia plantation and secondary forest in Loess Plateau of western Shanxi Province,using Enviro SMART soil moisture monitoring system. The results showed that： 1） The average moisture content of 0- 150 cm soil layer in three types of forests was ranked as secondary forest 〉P. tabulaeformis plantation〉 R. pseudoacacia plantation. 2） In general,the monthly changes of soil moisture in secondary forest and R. pseudoacacia plantation were consistent,while it was more volatile in the P. tabulaeformis plantation. The soil moisture contentin secondary forest was higher than that in the R. pseudoacacia plantation. 3） The total root density in 0- 30 cm soil layer followed the order of secondary forest 〉R. pseudoacacia plantation〉 P. tabulaeformis plantation,and the density decreased with the increase of soil depth. 4） In all the three forest types,there was a significantly negative correlation between soil moisture content and root density in 0- 30 cm soil depth. 5） In the 0- 30 cm depth,the contents of soil organic matters,total phosphorus and total potassium in secondary forest were significantly higher than those in the R. pseudoacacia and P. tabulaeformis plantations,with little difference betweenthe latter two types of plantation. 6） Contents of organic matters and total potassium decreased with the increase of soil depth,while no obvious change in total phosphorus content was found with the increase of soil depth in three types of forests.

关 键 词：土壤含水量 土壤有机质 全磷 全钾 水土保持林 黄土区 

分 类 号：S152.7[农业科学—土壤学] S158.3[农业科学—农业基础科学]