Variations of Moisture in Surface Soil of Alpine Meadow with Different Degradation Degrees in the Three-River Source Region

HUANG Qian; DING Mingjun; CHEN Liwen; XIE Kun

doi:10.13870/j.cnki.stbcxb.2022.01.025

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Variations of Moisture in Surface Soil of Alpine Meadow with Different Degradation Degrees in the Three-River Source Region

更新时间：2025-03-12

- Variations of Moisture in Surface Soil of Alpine Meadow with Different Degradation Degrees in the Three-River Source Region
- Vol. 36, Issue 1, Pages: 189-195(2022)
- 作者机构：
  
  1. 江西师范大学地理与环境学院,南昌,330022
  2. 鄱阳湖湿地与流域研究教育部重点实验室,南昌,330022
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.01.025
  CLC： S152.7
- Published：2022
- 稿件说明：
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HUANG Qian, DING Mingjun, CHEN Liwen, et al. Variations of Moisture in Surface Soil of Alpine Meadow with Different Degradation Degrees in the Three-River Source Region[J]. 2022, 36(1): 189-195.
DOI：

HUANG Qian, DING Mingjun, CHEN Liwen, et al. Variations of Moisture in Surface Soil of Alpine Meadow with Different Degradation Degrees in the Three-River Source Region[J]. 2022, 36(1): 189-195. DOI： 10.13870/j.cnki.stbcxb.2022.01.025.

摘要

土壤水分是影响青藏高原高寒草甸生态过程和生态承载能力关键因素之一

掌握其变化特征对于高寒地区生态保护和修复具有重要意义。基于HOBO土壤温湿度仪器监测数据

分析2019年8月至2020年8月三江源区不同退化程度(未退化(ND)、轻中度退化(LMD)

重度退化(HD))下高寒草甸表土层土壤3个层级L1(0—5 cm)、L2(5—15 cm)、L3(15—30 cm)土壤水分变化特征。结果表明: (1)不同退化程度下土壤含水量季节差异明显。高值区主要分布在夏季

低值区分布在冬春季。不同退化程度下土壤表层含水量年内均值大小依次为LMD(0.320 cm3/cm3)、ND(0.284 cm3/cm3)和HD(0.211 cm3/cm3)。(2)夏季降水事件结束后

土壤含水量24 h后开始明显减小

其中

L1层变化幅度最大

L3层变化幅度最小。(3)ND和LMD高寒草甸0—5 cm土层

HD高寒草甸5—15 cm土层对应的是相对较高含水层

这是由于土壤含水量与土壤容重呈显著负相关

与C/N、有机碳呈显著正相关。

Abstract

Soil moisture is one of the key factors affecting the ecological processes and ecological carrying capacity of alpine meadows in the Qinghai-Tibet Plateau. Mastering its change characteristics is of great significance for ecological protection and restoration in alpine region. Based on the soil moisture data monitored by hobo soil temperature and humidity instrument (HOBO Data Loggers-Onset Corporation of USA)

soil moisture change characteristics during August 2019 and August 2020 of three layers L1 (0—5 cm)

L2 (5—15 cm) and L3 (15—30 cm) of alpine meadow topsoil under different degradation stage sites

which were non-degradation (ND)

light to moderate degradation (LMD)

highly degradation (HD)

in the Three-River Source Region were analyzed. The results showed that: (1) There were significant seasonal variations in soil water content under different degradation stages. The high values mainly distributed in summer

while the low values distributed in winter and spring. The intra-annual mean values of topsoil water content under different degradation types followed the order of LMD (0.320 cm3/cm3)> ND (0.284 cm3/cm3) >HD (0.211 cm3/cm3). (2) After continuous rainfall in summer

the soil water content began to decrease significantly after 24 hours. Among them

the change range of L1 layer was the largest and that of L3 layer was the smallest. (3) The soil depth of 0—5 cm in ND and LMD alpine meadows

and the 5—15 cm of HD alpine meadows corresponded to a higher water content layer

because that the soil water content was significantly negatively correlated to soil water content and soil capacity

and significantly positively correlated to C/N and organic carbon.

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