岔口流域不同退耕还林地土壤养分分析  

Analysis of soil nutrient in different lands after Returning Farmland to Forests in Chakou Watershed

作　　者：王添乐 郭青霞[1] 王海斌[1] 丁一[1] 杜轶[1] 陈水英[1] WANG Tianle;GUO Qingxia;WANG Haibin;DING Yi;DU Yi;CHEN Shuiying(College of Resources and Environment, Shanxi Agricultural University, 030801,Jinzhong,Shanxi, China)

机构地区：[1]山西农业大学资源环境学院,山西晋中030801

出　　处：《中国水土保持科学》2021年第2期61-70,共10页Science of Soil and Water Conservation

基　　金：山西省哲学社会科学项目“乡村振兴背景下退耕还林可持续生态补偿研究”(2019B435);国家自然科学基金“基于AnnAGNPS模型的岔口小流域土地利用生态风险评价”(41071345)。

摘　　要：为了探究不同退耕还林地的土壤养分保持特征,以黄土高原丘陵沟壑区岔口流域不同退耕还林地为研究对象,对实施退耕还林后的生态林地(刺槐、柏树)、经济林地(核桃林地)土壤样品进行采集,并以坡耕地土壤样本为对照,采用单因素方差分析(one-way ANOVA)的方法进行不同样地0~20和20~40 cm土层养分含量的多重比较,以皮尔逊相关系数进行土壤养分间的相关分析性,并以修正的内梅罗公式对不同退耕还林样地土壤养分进行评价。结果表明:1)岔口流域退耕还林土壤养分含量多属于中等变异,表层(0~20 cm)土壤的各养分含量均高于20~40 cm土层;2)不同样地土壤养分含量总体上表现为生态林>经济林>坡耕地;3)退耕还林样地土壤的有机质与全氮、速效氮及速效钾含量呈显著相关;4)流域生态林土壤养分综合评价为“中”,经济林为“差”。该研究显示,岔口流域退耕还林地土壤养分保持效益总体上优于坡耕地,但不同退耕还林地土壤的各养分保持特征呈现出一定的差异性,对于生态林地与经济林地的土壤养分进行综合研究,可为不同模式退耕还林地土壤生态修复提供依据。[Background]The project of Returning Farmland to Forests is the largest ecological project in China and even in the world.The study on the soil nutrient characteristics of different land after Returning Farmland to Forests will provide the basis for soil remediation and improvement of different land where Returning Farmland to Forests is conducted.[Methods]In order to explore the characteristics of soil nutrient in different lands where Returning Farmland to Forests was conducted,taking the different lands after Returning Farmland to Forests in the Chakou Watershed in the loess hilly and gully region as study object,soil samples of ecological forest land(Robinia pseudoacacia,Platycladus orientalis)and economic forest land(Juglans regia)were collected.Taking soil samples of existing slope cropland as the reference substance,multiple comparisons of nutrients in soil layers of 0-20 cm and 20-40 cm in the different plots were conducted by one-way ANOVA,correlation analysis of soil nutrients by Pearson correlation coefficient,and the modified Nemerow formula was used to evaluate the soil nutrients in different plots.[Results]1)The soil nutrient contents of lands after Returning Farmland to Forests in Chakou Watershed was mostly moderate variation,variation coefficient of each nutrient content was concentrated in 20%-30%,nutrient content in the topsoil(0-20 cm)was higher than that in the 20-40 cm soil layer,reflecting the surface aggregation effect of forest soil,among them,the surface aggregation effect of organic matter and available nutrients were more obvious,the soil nutrient content of 0-20 cm soil layer was generally 30%more than that of 20-40 cm soil layer.2)Soil nutrient content in different plots ranked in the order of ecological forest>economic forest>slope cropland on the whole,however,we found that there was no significant difference in total phosphorus content among different plots,it may be related to the parent material in the soil.3)The correlation between the contents of total nitrogen,available nitro

关 键 词：退耕还林 生态林 经济林 土壤养分 

分 类 号：S158.3[农业科学—土壤学]