Effects of different restoration years on soil carbon sequestration and water retention capacity in bamboo forest: A case study in Southwest China Karst

IF 3.9 2区 环境科学与生态学 Q1 ECOLOGY
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Abstract

The Grain for Green Program (GGP) is an ecological protection plan launched by China. In this context, much cultivated land in Southwest China Karst has been converted into bamboo forest to balance both ecological and economic benefits. This study selected typical areas in southern Sichuan Province and used natural bamboo forests (CK) as controls to analyze the changes in soil carbon sequestration and water retention capacity of bamboo forests with different restoration periods. The results showed that there was no significant change in soil mechanical composition during forest restoration. The soil bulk density (BD) showed a decreasing trend overall with the restoration period. The total porosity (Pt) and capillary porosity (Pc) showed a trend of first decreasing and then increasing with the increase of restoration years, while no obvious change pattern was found in non-capillary porosity (Po). The variation characteristics of water retention capacity are similar to porosity, and returning farmland for 5 years can achieve good water retention performance, even higher than CK. The total organic carbon (TOC) and labile organic carbon (LOC) in the soil of bamboo forests after 20 years of returning farmland were significantly higher than those in 5 and 10 years of bamboo forests, and their organic carbon content was close to that of CK. It is worth noting that the soil organic carbon activity reached its optimal state after 10 years of returning farmland. To sum up, the implementation of the project of returning farmland to bamboo can effectively improve the soil carbon sequestration and water retention capacity. The research results provide a scientific basis for the optimization of the measures of the GGP, and help to promote the sustainable development in Southwest China Karst.
不同恢复年限对竹林土壤固碳和保水能力的影响中国西南喀斯特案例研究
绿色粮食计划(GGP)是中国推出的一项生态保护计划。在此背景下,中国西南喀斯特地区的许多耕地被改造成竹林,以兼顾生态和经济效益。本研究选取四川省南部典型地区,以天然竹林(CK)为对照,分析不同恢复期竹林土壤固碳量和保水能力的变化。结果表明,森林恢复期土壤力学组成无明显变化。土壤容重(BD)随着恢复期的延长呈总体下降趋势。总孔隙度(Pt)和毛细管孔隙度(Pc)随着恢复年限的增加呈先减后增的趋势,而非毛细管孔隙度(Po)则无明显变化规律。保水能力的变化特征与孔隙度相似,退耕 5 年可获得良好的保水性能,甚至高于 CK。退耕 20 年后竹林土壤的总有机碳(TOC)和可变有机碳(LOC)明显高于退耕 5 年和 10 年的竹林土壤,其有机碳含量接近 CK。值得注意的是,退耕 10 年后土壤有机碳活性达到最佳状态。综上所述,实施退耕还竹工程可有效提高土壤固碳和保水能力。研究成果为优化全球地质公园措施提供了科学依据,有助于促进中国西南喀斯特的可持续发展。
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来源期刊
Ecological Engineering
Ecological Engineering 环境科学-工程:环境
CiteScore
8.00
自引率
5.30%
发文量
293
审稿时长
57 days
期刊介绍: Ecological engineering has been defined as the design of ecosystems for the mutual benefit of humans and nature. The journal is meant for ecologists who, because of their research interests or occupation, are involved in designing, monitoring, or restoring ecosystems, and can serve as a bridge between ecologists and engineers. Specific topics covered in the journal include: habitat reconstruction; ecotechnology; synthetic ecology; bioengineering; restoration ecology; ecology conservation; ecosystem rehabilitation; stream and river restoration; reclamation ecology; non-renewable resource conservation. Descriptions of specific applications of ecological engineering are acceptable only when situated within context of adding novelty to current research and emphasizing ecosystem restoration. We do not accept purely descriptive reports on ecosystem structures (such as vegetation surveys), purely physical assessment of materials that can be used for ecological restoration, small-model studies carried out in the laboratory or greenhouse with artificial (waste)water or crop studies, or case studies on conventional wastewater treatment and eutrophication that do not offer an ecosystem restoration approach within the paper.
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