人为干预下喀斯特峰丛盆地区不同土地利用类型的土壤理化性质

The impact of human intervention in Karst peak cluster area in different land use types on soil physicochemical properties

以贵州喀斯特峰丛盆地区的清镇红枫湖石漠化治理示范区为研究区,运用野外调查取样和实验检测分析方法,研究不同土地利用方式对研究区土壤性质及生态环境的影响,分析石漠化发展的物理化学过程。结果表明:土壤含水量表现为:经果林>草地>国家天然保护林>耕地>封山育林>灌草丛>撂荒地,经果林是示范区毛管持水量最高的土地利用类型;土壤容重介于0.6~1.27 g/cm^3之间,土壤容重在不同土地利用类型上主要受人为干预影响较大;土壤总孔隙变化规律为:撂荒地>耕地>灌草丛>封山育林>国家天然保护林>草地>水田,撂荒地、封山育林地的非毛管孔隙比例较高,占总孔隙的34.45%~55.42%;研究区不同土地利用方式下,土壤p H值在7.3~7.8之间;国家天然保护林和封山育林地的总氮含量较高,土壤相对肥沃,土壤总钾含量均值在2.734 3~9.166 5g/kg。

In Guizhou Karst peak cluster area in Hongfeng Lake Basin rocky desertification demonstration area of Qingzhen as the study area,using field sampling and experimental detection analysis method to reveal the effects of different land use patterns on the peak cluster soil properties and ecological environment. And the soil physics and chemistry were analyzed to indicate the rocky desertification process in peak cluster area. Results showed that： Variation of soil water content： the orchard 〉 grassland 〉 National Natural Protection Forest 〉 arable land 〉 closing hillsides to facilitate afforestation 〉shrub 〉 fallow land,orchard was demonstration zone capillary to the highest water content of land use types and soil and water conservation of the main measures; Soil bulk density was between 0. 6 -1. 27g/cm,soil bulk density in different land types was mainly influenced by human intervention; Abandoned land,closing hillsides to facilitate afforestation of non-capillary porosity ratio higher,accounting for the total porosity of 34. 45% to 55. 42%; The soil p H value of research area were between7. 3 - 7. 8; 5） Natural forest protection and closing hillsides to facilitate afforestation of high content of total nitrogen,relatively fertile soil demonstration area soil total potassium content was average in 2. 734 3 - 9. 166 5g/kg.