半干旱黄土丘陵区不同植被类型的土壤水分特征及其稳定性  

Soil Moisture Characteristics and Stability of Different Vegetation Types in Semi-arid Loess Hilly Region

作　　者：殷地迟 王立[1] 蔡国军 莫保儒 柴春山 马驰 Yin Dichi;Wang Li;Cai Guojun;Mo Baoru;Chai Chunshan;Ma Chi(College of Forestry,Gansu Agriculture University,Lanzhou,Gansu 730070,China;Gansu Forestry Academy,Lanzhou,Gansu 730020,China)

机构地区：[1]甘肃农业大学林学院,甘肃兰州730070 [2]甘肃省林业科学研究院,甘肃兰州730020

出　　处：《水土保持通报》2020年第1期65-71,共7页Bulletin of Soil and Water Conservation

基　　金：国家重点研发计划项目“宽梁缓坡丘陵区人工灌草稳定性维持与功能提升技术和示范”(2017YFC0504603)。

摘　　要：[目的]研究5种不同植被类型土壤水分动态特征,为区域内优化配植模式提供理论依据.[方法]以甘肃省定西市半干旱黄土丘陵区5种典型的植被类型为研究对象,使用土壤水分速测仪对2017,2018年0-200 cm土层土壤含水量进行观测,并对不同植被类型土壤水分特征及其稳定性进行分析.[结果]①不同植被类型土壤水分呈现出:山杏×侧柏混交林地(11.24%)>退耕苜蓿草地(10.97%)>自然荒地(10.66%)>退耕林地(9.99%)>柠条林地(9.55%).②5种植被类型在0 200 cm土层依据有序聚类法可分为动态变化层(0-40 cm),利用层(40-100 cm)和弱利用层(100-200 cm)3个层次.在动态变化层(0-40 cm),土壤水分呈现出:自然荒地(14.23%)最高,柠条林地(11.04%)最低;在利用层(40-100 cm):退耕苜蓿草地(12.16%)最高,柠条林地(9.15%)最低;在弱利用层(100-200 cm):自然荒地(10.81%)最高,退耕林地(8.61%)最低.③不同植被类型土壤水分土层稳定性(变异系数)呈现出:退耕林地(19.9%)<山杏×侧柏混交林地(21.3%)<自然荒地(21.9%)<退耕苜蓿草地(22.6%)<柠条林地(23.6%).④不同植被类型土壤水分时间稳定性(变异系数)呈现出:自然荒地(25%)<退耕林地(25.2%)<山杏×侧柏混交林地(26.5%)<柠条林地(27.1%)<退耕苜蓿草地(31.9%).[结论]柠条林地土壤水分含量最低,在土层和时间上不稳定,山杏×侧柏混交林地较其他植被类型土壤水分含量更高,更具有稳定性.[Objective]The dynamic characteristics of soil moisture of five different vegetation types were studied to provide a theoretical basis for optimizing plantation mode.[Methods]Five typical vegetation types from the semi-arid loess hilly region of Dingxi City,Gansu Province,were selected.The soil moisture content of the soil layer from 0 to 200 cm in depth was observed in 2017 and 2018 using a soil moisture tachometer.The characteristics and stability of soil moisture of different vegetation types were analyzed.[Results]①The soil moisture content of different vegetation types was:mixed forest of Armeniaca sibirica and Platycladus orientalis(11.24%)>Medicago sativa grassland(10.97%)>natural grassland(10.66%)>returning farmland(9.99%)>Caragana korshinskii forest(9.55%).②According to the orderly clustering method,the 0—200 cm soil layer of the five vegetation types could be divided into three sublayers:dynamic change layer(0—40 cm),utilization layer(40—100 cm),and weak utilization layer(100—200 cm).In the dynamic change layer(0—40 cm),the soil moisture content was the highest in the natural grassland(14.23%)and lowest in the C.korshinskii forest(11.04%);In the utilization layer(40—100 cm),the soil water content was the highest in the M.sativa grassland(12.16%)and lowest in the C.korshinskii forest(9.15%);In the weak utilization layer(100—200 cm),the soil water content was the highest in the natural grassland(10.81%)and lowest in the returning farmland(8.61%).③The layer stability of soil moisture(coefficient of variation)in the different vegetation types was:returning farmland(19.9%)<mixed forest of A.sibirica and P.orientalis(21.3%)<natural grassland(21.9%)<M.sativa grassland(22.6%)<C.korshinskii forest(23.6%).④The temporal stability of soil moisture(coefficient of variation)in the different vegetation types was:natural grassland(25%)<returning farmland(25.2%)<mixed forest of A.sibirica and P.orientalis(26.5%)<C.korshinskii forest(27.1%)<M.sativa grassland(31.9%).[Conclusion]In the semi-arid loes

关 键 词：黄土丘陵区 土壤水分 植被类型 稳定性 

分 类 号：S157.2[农业科学—土壤学] S152.7[农业科学—农业基础科学]