摘要
为探究半干旱黄土区柠条灌丛在不同植被管理方式下的土壤水分特征,本文以甘肃省定西市龙滩流域为研究区,通过对2016-2018年生长季0-1.8 m土层土壤水分动态检测,分析人工柠条灌丛[柠条锦鸡儿(Caragana korshinskii)]不同植被管理方式[对照(不平茬也不除草)、平茬除草、平茬、除草]对土壤水分的影响。结果表明:1)平茬除草管理方式的土壤水分最高,在上、中、下坡位均高于其他3种管理方式的土壤水分。2)在整个生长季内,各管理方式0-0.4 m浅层土壤水分波动最大,而1.0-1.8 m较深土层则无明显变化。温度和降水对土壤水分有一定的影响,但无论是干旱年还是平水年,平茬除草管理方式在各土层中土壤水分均高于其他3种管理方式的土壤水分。3)采用最优分割法将不同植被管理方式的土壤水分划分为活跃层、次活跃层和相对稳定层,平茬除草管理方式土壤水分的活跃层与次活跃层的深度为0-0.8 m,其深度大于其他3种管理方式;而对照管理方式土壤水分在0.3 m以下都为相对稳定层,其深度小于其他3种管理方式。本研究结果表明,在生长季平茬除草管理方式更适合研究区柠条灌丛植被的管理,这为该区域人工植被土壤水分管理以及构建半干旱黄土区稳定的人工植被群落提供了参考。
In this study, the effects of different vegetation management methods [CK(no stubble and no weeding), stubble and weeding, stubble, or weeding] on soil moisture in Caragana korshinskii shrubs were analyzed through the dynamic detection of soil moisture in a 0–1.8 m soil layer in the growing season between 2016-2018, in the Longtan catchment of Dingxi in Gansu Province, China, in order to explore the soil moisture of C. korshinskii in semi-arid loess areas under different vegetation management methods. The results showed that: 1) The stubble and weeding management resulted in the highest soil moisture, and the soil moisture corresponding to the stubble and weeding management method was higher than that related to the other three management methods in the uphill, middle, and downhill slopes. 2) During the entire growing season, each management method resulted in 0-0.4 m shallow soil moisture fluctuation at the maximum, while no significant change could be observed for 1.0-1.8 m soils. The temperature and rainfall exhibited a certain impact on the soil water characteristics but, regardless of arid or flat water years, the stubble and weeding management resulted in higher soil moisture of the soil layer than the other three management methods. 3) The soil moisture related to the different vegetation management methods could be divided into the active, second active, and stable layers using the optimal segmentation method. In the case of the stubble and weeding management of soil moisture, the active and secondary active layers were at 0-0.8 m, corresponding to a more significant depth than in the case of the other three management methods. Moreover, the CK soil moisture content was below 0.3 m, its depth was less than that of the other three management methods. The results of this study show that during the growing season of the study area, stubble and weeding are more suitable for the vegetation management of Caragana korshinskii shrubs in the area. Furthermore, it is important for the soil moisture management of
作者
刘剑荣
杨磊
卫伟
张钦弟
LIU Jianrong;YANG Lei;WEI Wei;ZHANG Qindi(College of Life Sciences,Shanxi Normal University,Linfen 041004,Shanxi,China;State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)
出处
《草业科学》
CAS
CSCD
北大核心
2021年第8期1439-1450,共12页
Pratacultural Science
基金
国家自然科学基金项目(41971129、41871194、41601027)。
关键词
半干旱黄土区
柠条
植被管理方式
土壤水分
坡位
降水
有序聚类法
semi-arid loess region
Caragana korshinskii
vegetation management
soil moisture
slope position
rainfall
sequential clustering method
