Temporal-spatial Variation of Soil Moisture Content of Different Hippophae Rhamnoides Communities in an Alpine Desert

He Xiaofan; Tian Lihui; Wang Haijiao; Jin Yaotao; Li Yao

doi:10.13961/j.cnki.stbctb.20230420.001

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Temporal-spatial Variation of Soil Moisture Content of Different Hippophae Rhamnoides Communities in an Alpine Desert

- Temporal-spatial Variation of Soil Moisture Content of Different Hippophae Rhamnoides Communities in an Alpine Desert
- Bulletin of Soiland Water Conservation Vol. 43, Issue 2, Pages: 23-33(2023)
- 作者机构：
  
  青海大学省部共建三江源生态和高原农牧业国家重点实验室,青海,西宁,810016
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20230420.001
  CLC： S793.6
- Published：2023
- 稿件说明：
移动端阅览
He Xiaofan, Tian Lihui, Wang Haijiao, et al. Temporal-spatial Variation of Soil Moisture Content of Different Hippophae Rhamnoides Communities in an Alpine Desert[J]. Bulletin of Soiland Water Conservation, 2023, 43(2): 23-33.
DOI：

He Xiaofan, Tian Lihui, Wang Haijiao, et al. Temporal-spatial Variation of Soil Moisture Content of Different Hippophae Rhamnoides Communities in an Alpine Desert[J]. Bulletin of Soiland Water Conservation, 2023, 43(2): 23-33. DOI： 10.13961/j.cnki.stbctb.20230420.001.

摘要

[目的] 研究高寒半干旱区沙棘群落内的土壤水分时空变异特征及其影响因素，为青海湖流域沙地生态系统恢复提供科学依据，为半干旱风沙区生态环境保护和建设提供理论指导。 [方法] 以青海湖东克土沙地不同年限栽植的人工沙棘(Hippophae rhamnoides)群落为研究对象，在2020和2021年生长季，对各沙棘群落进行植被调查和土壤取样。通过经典统计学方法，对沙棘在不同沙丘地貌部位的植被特征和土壤水分的时空变化特征进行综合分析。[结果] ①就植株株高来看，2008年栽植的沙棘(08SJ)植株高度最高，其次为1987年栽植的沙棘(87SJ)，2015年栽植的沙棘(15SJ)株高最小。植被盖度表现为：87SJ＞15SJ＞08SJ； ②土壤含水量表现为:87SJ＞08SJ＞15SJ，87SJ与15SJ均在迎风坡土壤含水量最高，而08SJ土壤含水量在背风坡达最大值； ③土壤水分呈现明显的季节变化，各样地都表现为生长旺盛期土壤含水量最低而生长末期最高； ④土壤水分随土层深度的增加整体表现为0—20 cm处土壤含水量最高，在60 cm深度以下变化逐渐趋于稳定。 [结论] 土壤水分在高寒半干旱沙区沙棘群落下的分布除受到局地降水量、植被分布格局的影响外，还与沙丘微地貌形态有关。

Abstract

[Objective] The temporal-spatial variation of soil moisture and its influencing factors for semi-arid alpine desert communities of Hippophae rhamnoides were studied in order to provide a scientific basis for the restoration of ecosystems of Qinghai Lake and semi-arid deserts. [Methods] H. rhamnoides plantations were taken as the research object. In the growing seasons of 2020 and 2021

vegetation investigation and soil sampling was carried out on the H. rhamnoides communities in the Ketu sandy land on the eastern shore of Qinghai Lake. Through the use of classical statistical methods

the vegetation characteristics of H. rhamnoides and the temporal-spatial changes of soil moisture in different dune geomorphic parts were comprehensively analyzed. [Results] ① In terms of vegetation growth

plant height of H. rhamnoides planted in 2008 (08SJ) was the tallest

followed by plant height in 1987 (87SJ). Plant height in 2015 (15SJ) was the shortest. Vegetation coverage followed the order of 87SJ>15SJ>08SJ. ② Soil moisture content of H. rhamnoides communities followed the order of 87SJ>08SJ>15SJ. Among these communities

the soil moisture contents of the H. rhamnoides planted in 1987 (87SJ) and the H. rhamnoides planted in 2015 (15SJ) were the highest on the windward slope

while the soil moisture content of the H. rhamnoides planted in 2008 (08SJ) reached the maximum value on the leeward slope; ③ Soil moisture content showed obvious seasonal variation

and the soil moisture content was the lowest in the vigorous growth period

and highest at the end of the growing season. ④ Soil moisture content was highest in the 0—20 cm soil layer

and changed little below a depth of 60 cm. [Conclusion] Vegetation distribution pattern

precipitation

and its seasonal changes were the main factors affecting the temporal-spatial variation of soil moisture under H. rhamnoides communities in a semi-arid alpine desert ecosystem.

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