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| Analysis on effect of gully control and land reclamation projects on carbon emission in hilly and gully regions of Loess Plateau |
| Received:July 18, 2017 Revised:October 16, 2017 |
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| KeyWord:gully control and land reclamation;land consolidation;carbon emission;hilly and gully regions of the Loess Plateau |
| Author Name | Affiliation | E-mail | | LEI Na | Institute of Soil and Water Conservation, Northwest A & F University, Yangling 712100, China
Shaanxi Provincial Land and Engineering Construction Group CO., LTD., Xi'an 710075, China | | | MU Xing-min | State Key Laboratory of Soil Erosion and Dryland Farming of the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China | xmmu@msn.iswc.ac.cn |
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| Abstract: |
| Hilly and gully regions comprise the main loess landforms of the Loess Plateau in China. These landforms are a result of the loose texture of soil, serious destruction of the ecological system and vegetation, and rainwater erosion of the surface during the rainy season. A gully control and land reclamation project aimed at special features on the Loess Plateau has been undertaken in the hilly and gully regions in Yan'an. This project integrated dam system construction, old dam reparation, saline-alkali land reform, waste valleys idle-land utilization, and ecological construction as a new model of gully management. The gully control and land reclamation project includes land leveling engineering, irrigation and drainage engineering, field road engineering, and farmland protection and ecological protection engineering; thus, the implementation of the project will affect carbon emissions regionally. Recent research have mainly focused on changes in carbon emissions resulting from different land use types and low carbon emission from land-use by measures such as land planning. However, research on carbon emissions in land improvement engineering are still in the exploration stage. The study analysis of carbon emissions from the gully control and land reclamation project and changes in carbon emissions before and after regulation have not been conducted so far. In order to study the effect of the project on carbon emission in the hilly and gully regions of the Loess Plateau, this study analyzed changes in carbon emissions caused by land leveling, irrigation and drainage, road construction, farmland protection, and land use using carbon emission measurements from IPCC and the sampling method from the multipurpose regional geochemical investigation and specification compiled by the China Geological Survey. Changes before and after the project were also analyzed supporting by the practice of gully control and land reclamation in Nanniwan Town, Yan'an. The main results of this study are as follows:Carbon emissions from the construction sector was 3.76 t·hm-2, showing the effect of carbon source. One of the biggest contributors to carbon emissions was land leveling(2 335.50 t). The minimum amount of carbon emissions was by farmland protection engineering as 0 t·hm-2. After the implementation of the project, changes in land use types increased carbon storage by 95.34 t·hm-2, showing the effect of carbon sink. Because cultivation area increased, carbon reserves increased by 1 119.72 t·hm-2, and that of paddy fields increased the most by 716.54 t·hm-2. The carbon reserves were reduced by 1 024.38 t·hm-2 because of the reduction of garden land and construction of transportation and water conservancy facilities; the reduction caused by the construction of water facilities on water and land up to 807.50 t·hm-2. Changes in land use type after the implementation of the gully control and land reclamation project offset the carbon emissions from the construction sector. The carbon reserves of the project increased by 91.58 t·hm-2. Our results indicated that the gully control and land reclamation project had a carbon sink effect overall, which is beneficial to the increase of regional carbon reserves. |
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