黄土区不同土地利用类型下砂质壤土地表CO2通量变化特征——以清凉寺沟流域为例

doi:10.13866/j.azr.2021.04.11

干旱区研究 ›› 2021, Vol. 38 ›› Issue (4): 1000-1009.doi: 10.13866/j.azr.2021.04.11

黄土区不同土地利用类型下砂质壤土地表CO₂通量变化特征——以清凉寺沟流域为例

许志平¹(),邵天杰¹(),张连凯²,邵明玉²,牛俊杰³

1.陕西师范大学地理科学与旅游学院,陕西西安 710119
2.中国地质科学院岩溶地质研究所,广西桂林 541004
3.太原师范学院汾河流域科学发展研究中心,山西太原 030012

收稿日期:2020-11-11 修回日期:2021-04-03 出版日期:2021-07-15 发布日期:2021-08-03
通讯作者: 邵天杰
作者简介:许志平(1995-),男,硕士研究生,主要研究方向为环境污染评价与治理. E-mail: 192060@snnu.edu.cn
基金资助:
国家自然科学基金面上基金项目(41671213);陕西省博士后科学基金项目(2016BSHEDZZ27)

Study on the change of surface CO₂ flux in sandy loamy soil under different land use types: An example from the Qingliangsi ditch watershed

XU Zhiping¹(),SHAO Tianjie¹(),ZHANG Liankai²,SHAO Mingyu²,NIU Junjie³

1. School of Geographical Science and Tourism, Shaanxi Normal University, Xi’an 710119, Shaanxi, China
2. Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, Guangxi, China
3. Research Center for Scientific Development of Fenhe River Valley, Taiyuan Normal University, Taiyuan 030012, Shanxi, China

Received:2020-11-11 Revised:2021-04-03 Online:2021-07-15 Published:2021-08-03
Contact: Tianjie SHAO

摘要/Abstract

摘要：

利用LI-8100A土壤碳通量自动测量系统对晋西北黄土丘陵沟壑区清凉寺沟流域地表土壤CO₂通量进行测量,探讨了CO₂通量时空变化特征、不同土地利用类型下的CO₂通量特征以及环境因子对CO₂通量的影响,对于晋西北黄土丘陵沟壑区小流域地区地表土壤CO₂通量的研究进行补充。结果表明:(1) CO₂通量在生长季呈现单峰变化,于日出前后达单日最低值,在16:00—22:00达到单日最高值;在非生长季则呈现不规律变化。(2) 农耕地的CO₂通量相较于荒草地以及枣林地的CO₂通量要低;不同季节的CO₂通量关系为8月CO₂通量最大,5月CO₂通量次之,11月CO₂通量最低。(3) 地表土壤CO₂通量与光合有效辐射、大气温度、土壤温度、土壤含水率、土壤有机质、土壤质地等因素密切相关,通过科学的土地利用方式可有效提高土壤的固碳能力。

关键词: 土壤CO₂通量, 时空变化特征, 影响因素, 土地利用类型, 黄土丘陵沟壑区, 晋西北

Abstract:

Global climate change is closely related to the carbon cycle, and exploring changes in surface carbon emissions is an essential aspect of climate change research. In this study, the CO₂ fluxes of surface soils in Qingliangsigou watershed of Loess Hills and Gullies in northwest Shanxi were measured using an LI-8100A soil carbon flux automatic measurement system, the soil particle size was measured using a laser particle size analyzer (mastersizer 2000), the soil organic matter was measured using a chemical titration method, and the soil water content was measured using the drying method. Additionally, we explored the diurnal and spatial variation of surface soil CO₂ fluxes, temporal and spatial changes, CO₂ fluxes under different land use types, and the influence of environmental factors on surface soil CO₂ fluxes to complement the study of surface soil CO₂ fluxes in small watershed areas in the Loess Hills and Gullies of northwest Shanxi. We found that CO₂ fluxes showed a single peak in variation during the growing season, reaching a single day minimum around sunrise and a single day maximum between 16:00 and 22:00, and in the non-growing season, there was irregular variation. The CO₂ fluxes of farmland were lower than the CO₂ fluxes of waste grassland and jujube forest land. The highest CO₂ fluxes were observed in August, followed by May, and the lowest CO₂ flux was in November. The CO₂ flux of surface soil was closely related to photosynthetic effective radiation, atmospheric temperature, soil temperature, soil water content, soil organic matter, and soil texture. Therefore, the carbon fixation of soil can be effectively improved through scientific land use. In conclusion, the results of this study can be applied to most of the Loess Plateau and used to improve the ecological environment.

Key words: soil CO₂ flux, spatial and temporal variation characteristics, influencing factors, land use type, loess hilly gully area, northwest Shanxi

许志平,邵天杰,张连凯,邵明玉,牛俊杰. 黄土区不同土地利用类型下砂质壤土地表CO₂通量变化特征——以清凉寺沟流域为例[J]. 干旱区研究, 2021, 38(4): 1000-1009.

XU Zhiping,SHAO Tianjie,ZHANG Liankai,SHAO Mingyu,NIU Junjie. Study on the change of surface CO₂ flux in sandy loamy soil under different land use types: An example from the Qingliangsi ditch watershed[J]. Arid Zone Research, 2021, 38(4): 1000-1009.

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月份	地点	土壤含水率/%	有机质含量/%
5	YZ	6.66	9.92
5	QY	10.90	8.09
5	ZC	8.84	9.42
5	ZY	13.62	8.04
8	YZ	15.54	11.84
8	QY	5.51	8.50
8	ZC	4.65	5.02
8	ZY	6.86	8.30
11	YZ	12.03	8.92
11	QY	12.05	11.22
11	ZC	14.24	5.59
11	ZY	12.75	5.40

黄土区不同土地利用类型下砂质壤土地表CO₂通量变化特征——以清凉寺沟流域为例

Study on the change of surface CO₂ flux in sandy loamy soil under different land use types: An example from the Qingliangsi ditch watershed

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