Soil Carbon Flux and Component Characteristics in the Plantation of Different-aged Robinia pseudoacacia L. Forests in Longdong Loess Plateau

doi:10.13870/j.cnki.stbcxb.2017.05.031

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Soil Carbon Flux and Component Characteristics in the Plantation of Different-aged Robinia pseudoacacia L. Forests in Longdong Loess Plateau

更新时间：2025-03-12

- Soil Carbon Flux and Component Characteristics in the Plantation of Different-aged Robinia pseudoacacia L. Forests in Longdong Loess Plateau
- Vol. 31, Issue 5, Pages: 196-202(2017)
- 作者机构：
  
  1. 甘肃省水土保持科学研究所,兰州,730020
  2. 中国林业科学研究院荒漠化研究所,北京,100091
  3. 中国水利水电科学研究院泥沙研究所,北京,100048
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2017.05.031
  CLC： S718.55+4
- Published：2017
- 稿件说明：
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Soil Carbon Flux and Component Characteristics in the Plantation of Different-aged Robinia pseudoacacia L. Forests in Longdong Loess Plateau[J]. 2017, 31(5): 196-202.
DOI：

Soil Carbon Flux and Component Characteristics in the Plantation of Different-aged Robinia pseudoacacia L. Forests in Longdong Loess Plateau[J]. 2017, 31(5): 196-202. DOI： 10.13870/j.cnki.stbcxb.2017.05.031.

摘要

基于红外气体分析技术，对陇东黄土高原田家沟水土保持科技示范园不同林龄（12

18 a）刺槐林土壤碳通量进行定位监测，同时以荒草地为对照，分析土壤碳通量日、季变化及组分特征。结果表明：不同林龄刺槐林土壤碳通量日变化差异显著（P＜0.01），日变化趋势表现为昼高夜低的单峰曲线，13:00—15:00达到最大值，最小值出现在2:00—5:00；不同季节间土壤碳通量差异显著（P＜0.01），具体表现为夏季＞春季＞秋季＞冬季，夏季土壤碳通量为冬季的8.78～20.32倍；刺槐林春季土壤碳通量以自养呼吸为主，夏、秋两季以异养呼吸为主，冬季自、异养呼吸贡献率基本一样，荒草地春、夏、秋3季以异养呼吸为主，冬季与林地表现一致；刺槐林年土壤CO2排放量随林龄增加而增加，年排放量2 069.63～4 590.35 g/m2，荒草地土壤CO2年排放量2 806.27 g/m2，低于18 a刺槐林，高于其余各林龄。研究结果为陇东黄土高原刺槐人工林土壤的固碳效应及经营措施提供依据。

Abstract

A typical artificial Robinia pseudoacacia plantation was used to study the characteristics of daily and seasonal soil carbon flux variation

and the changes of soil carbon flux components in different stand ages (12

18 a) at Tianjiagou soil and water conservation technology garden of the Longdong Loess Plateau. Soil carbon flux was monitored using the infrared gas analysis technology and the grassland was used as control. The results indicated that the daily soil carbon flux of different ages showed significant difference (P<0.01). The diurnal soil carbon flux trend presented a single peak curve

the highest value occurred in the daytime (13:00—15:00) while the lowest was detected at night (2:00—5:00). In addition

seasonal soil carbon flux exhibited significant difference of different ages (P<0.01)

The seasonal trends were in the order of summer > spring > autumn > winter. Soil carbon flux in summer was 8.78 to 20.32 times larger than that in winter. Soil carbon flux in spring was mainly with autotrophic respiration

while in summer and autumn with heterotrophic respiration

the contribution rate of autotrophic and heterotrophic respiration was basically the same in winter. For the grassland

soil carbon flux was mainly based on heterotrophic respiration in spring

summer and autumn

which was similar to R. pseudoacacia plantation in winter. The soil carbon flux of R. pseudoacacia plantation increased with the stand age with the annual soil carbon flux of 2 069.63 to 4 590.35 g/m2. The annual soil carbon flux of grassland was 2 806.27 g/m2

which was lower than that of the 18 a R. pseudoacacia plantation but higher than that of the other stand ages. Our study could provide a scientific basis for soil carbon sequestration and management measures of artificial R. pseudoacacia plantation in Longdong Loess Plateau.

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