风水穴地土壤结构稳定性及其影响因子  

Soil Structure Stability of Fengshui Point and Its Influencing Factors

作　　者：陈建国[1,2,3] 闫文德[1,2,3] 项文化[1,2,3] 

机构地区：[1]中南林业科技大学生命科学与技术学院,长沙410004 [2]南方林业生态应用技术国家工程实验室,长沙410004 [3]国家野外科学研究站,湖南会同418307

出　　处：《水土保持学报》2013年第1期267-272,276,共7页Journal of Soil and Water Conservation

基　　金：国家林业局林业生态科技工程项目(2011BAD38B00);中南林业科技大学人才引进基金项目(104-0116)

摘　　要：为探明风水穴地及其周围地块土壤结构稳定性的变化规律及环境影响机制,通过野外采样、室内测试及数理统计等方法对长沙地区典型的传统风水穴地土壤稳定性进行研究。结果表明,风水穴地土壤结构稳定性高于周围地块,其中穴地土壤>2mm的水稳性团粒数量分别比山腰、山顶平均提高7.4%,23.2%,平均重量直径分别提高3.5%,13.8%;风水穴地土壤微生物生命活动较旺盛,其中穴地土壤微生物活度比山腰、山顶分别提高16.9%,32.5%;土壤水、气、热对微生物的和谐度穴地明显高于山腰、山顶,其中基于土壤温度、湿度、通气度对微生物活度直接通径系数的标准差系数在山腰、山顶土壤平均分别是在穴地的17.6,20.8倍。研究显示,风水穴地土壤稳定性较高是源于较大的土壤微生物活度对土壤水稳性大团粒形成的促进作用,而其较大的土壤微生物活度则是受益于穴地土壤水、气、热和谐优势。To ascertain the soil structure stability around Fengshui point and its mechanism affected by environmental factors, an investigation had been conducted on traditional Fengshui point in Changsha by field sampling, indoor test, and mathematical statistics. The results showed, the soil stability in Fengshui point was higher than that in surrounding land, among that the number of water stable aggregates above 2 mm in Fengshui point soil increased by 7.4% and 23.2% based on that in hillside and hilltop, respectively, and MWD increased by 3.5% and 13.8~ accordingly; the microbial life activity was more vigorous in Fengshui point soil, for example, soil microbial activity in Fenshui point was higher 16.9% and 32.5% averagely than that in hillside and hilltop~ the degree of harmony which soil water, gas and heat acting on soil microbial activity were more higher in Fengshui point than that in surrounding land, such as the standard deviation coefficient based on direct path coefficients, which soil temperature, soil moisture, and soil aeration degree interrelated to soil microbial activity in hillside and hilltop, were averagely 17. 6, 20. 8 times of that in Fengshui point, respectively. According to the above results, higher soil stability in Fengshui point owed to its higher soil microbial activity that promote the formation of large water-stable aggregate, and the higher soil microbial activity benefited from harmony advantage of soil water, gas and heat in Fengshui point.

关 键 词：风水穴地 土壤团粒 稳定性 影响因子 

分 类 号：S152.4[农业科学—土壤学] S154.1[农业科学—农业基础科学]