Decomposition Characteristics of Different Litters in the Desert Steppe Under Enclosure Measures

MENG Zhongju; WAN Fang

doi:10.13870/j.cnki.stbcxb.2021.01.046

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Decomposition Characteristics of Different Litters in the Desert Steppe Under Enclosure Measures

更新时间：2025-03-12

- Decomposition Characteristics of Different Litters in the Desert Steppe Under Enclosure Measures
- Vol. 35, Issue 1, Pages: 319-325(2021)
- 作者机构：
  
  1. 内蒙古农业大学沙漠治理学院,呼和浩特,010018
  2. 中央与地方共建风沙物理重点实验室,呼和浩特,010018
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.01.046
  CLC： S157.9
- Published：2021
- 稿件说明：
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MENG Zhongju, WAN Fang. Decomposition Characteristics of Different Litters in the Desert Steppe Under Enclosure Measures[J]. 2021, 35(1): 319-325.
DOI：

MENG Zhongju, WAN Fang. Decomposition Characteristics of Different Litters in the Desert Steppe Under Enclosure Measures[J]. 2021, 35(1): 319-325. DOI： 10.13870/j.cnki.stbcxb.2021.01.046.

摘要

以荒漠草原优势植物羊草（Leymus chinensis）、短花针茅（Stipa breviflora）及羊草+短花针茅（Leymus chinensis+Stipa breviflora）枯落物为研究对象，通过模拟试验，采用分解袋法，测定不同枯落物在分解过程中残留率的变化，分析枯落物元素释放规律及分解过程中对土壤性质的影响。结果表明：（1）在整个试验期内，不同枯落物残留率和质量损失率呈慢—快趋势，分解速率表现为羊草+短花针茅 > 短花针茅 > 羊草；试验区枯落物分解可以较好地拟合为Olson模型，不同枯落物分解50%和95%分别需要2.79~3.15，12.05~13.62年；（2）经过360天的分解，不同枯落物的全C、N、P均表现为释放的状态（NAI < 100%），其中全C呈现波动释放的变化特征，释放比例为47.88%~54.54%；全N、全P呈释放—富集—释放的变化特征，其释放比例分别为36.34%~47.87%，57.08%~74.71%。（3）不同枯落物的分解均提高土壤有机C、N、P含量，均比初始值分别增加1.41~1.50，1.27~1.40，0.14~0.15 g/kg。研究结果为草地生态系统元素循环过程提供理论依据。

Abstract

Withered Litters from Leymus chinensis

Stipa breviflora and Leymus chinensis + Stipa breviflora were taken as the research object. The decomposition bag method was used to measure the residual rates of different litters through a simulation experiment

and to analyze the release law of litter elements and the influence on soil properties during the decomposition process. The results showed that: (1) During the whole test period

the residual rates and mass loss rate sof different litters showed a slow-fast trend

and the decomposition rates showed Leymus chinensis + Stipa breviflora > Stipa breviflora > Leymus chinensis. The litter decomposition in the test area could be well fitted by Olson model. Decomposing 50% and 95% of different litters needed 2.79~3.15 and 12.05~13.62 years

respectively. (2) After 360 days of decomposition

the total C

N and P of different litters all showed the state of release (NAI < 100%)

and the total C showed the characteristic of fluctuating release

with the release ratio ranging from 47.88% to 54.54%. Total N and P showed the characteristics of release-enrichment-release

with the release ratios of 36.34%~47.87% and 57.08%~74.71%

respectively. (3) Decomposition of different litters increased the contents of soil organic C

N and P

which increased by 1.41~1.50 g/kg

1.27~1.40 g/kg and 0.14~0.15 g/kg respectively compared with the initial values. These research results could provide theoretical basis for the element circulation process of grassland ecosystem.

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