作 者：
张伟畅;周清;谢红霞;彭育桐;冯旖;吴婷华;张杨珠
单 位：
土壤肥料资源高效利用国家工程实验室;湖南农业大学资源环境学院
关键词：
农田;耕层;土壤碳;碳密度;碳储量;湘西山区
摘 要：
【目的】研究湘西山区农田耕层土壤有机碳储量及分布特征,为有效地促进山区农田资源的科学利用与保护,减缓农业生产造成的有机碳损失和温室气体排放提供依据。【方法】借助土壤类型图、地貌类型图、土地利用现状图和数字高程模型,结合野外土壤样品采集、室内分析和GIS空间分析方法,估算湘西典型山区地形条件下的洪江市农田耕层土壤有机碳密度和储量,分析该市农田碳密度分布特征。【结果】洪江市农田耕层土壤平均有机碳密度为40.48 t/ha,有机碳储量约1171831.62 t。不同地貌条件的耕层土壤有机碳密度表现为:中山(44.59 t/ha)>河口三角洲(44.22 t/ha)>低山(42.88 t/ha)>冲积平原(36.20 t/ha)>台地(34.98 t/ha)>丘陵(32.73 t/ha)。不同土壤类型的有机碳密度依次为:红壤(47.92 t/ha)>黄壤(45.27 t/ha)>水稻土(40.10 t/ha)>紫色土(38.69 t/ha)>潮土(37.62 t/ha);水稻土亚类有机碳密度为38.05~43.32 t/ha,以淹育型水稻土最高,漂白型最低。【结论】洪江市农田耕层土壤有机碳密度高于全国平均水平,其空间分布受地势、土壤类型及不同区域气候因素的影响,总体表现为东南部地区较高,中西部地区较低。
译 名：
Storage and distribution of organic carbon in plow layer of cultivated land in mountainous areas of western Hunan——A case study of Hongjiang city
作 者：
ZHANG Wei-chang;ZHOU Qing;XIE Hong-xia;PENG Yu-tong;FENG Yi;WU Ting-hua;ZHANG Yang-zhu;National Engineering Laboratory of Soil Fertilizer Resources Efficient Utilization;College of Resources and Environment,Hunan Agricultural University;
关键词：
cultivated land;;plow layer;;soil carbon;;carbon density;;carbon storage;;mountain area of western Hunan
摘 要：
【Objective】The storage and distribution of organic carbon in plow layer of cultivated land in mountainous areas were investigated to protect and utilize effectively and scientifically cultivated land of mountainous areas, in order to provide references for mitigate loss of organic carbon and emission of greenhouse gas which were caused by unreasonable agricultural production. 【Method】By applying soil type map, geomorphic type map, land-use map and DEM, the organic carbon density and storage in plow layer of cultivated land of Hongjiang city were estimated, which was typical mountainous terrain of western Hunan, the spatial distribution of organic carbon density was analyzed based on soil sampling, lab analysis and GIS spatial analysis. 【Result】The results showed that there was 1171831.62 t organic carbon in plow layer of cultivated land in Hongjiang city, and the organic carbon density was about 40.48 t/ha. According to organic carbon density, the order of cultivated lands with different physiognomy was as follow: middle mountain(44.59 t/ha) >estuary delta(44.22 t/ha)>low mountain(42.88 t/ha)>alluvial plain(36.20 t/ha) >platform(34.98 t/ha) >hill land(32.73 t/ha). And according to organic carbon density, the order of different soil types was as follow:red soils(47.92 t/ha)>yellow soils(45.27t/ha)>paddy soils(40.10 t/ha)>purple soils(38.69 t/ha)>fluvo-aquic soils(37.62 t/ha). In addition, the organic carbon densities of different paddy soil subgroup ranged from 38.05 to 43.32 t/ha, the highest was submerged paddy soil and the lowest was bleached paddy soil. 【Conclusion】The density of organic carbon in plow layer of cultivated land in Hongjiang city is higher than national average density of organic carbon. Furthermore, the spatial distribution of organic carbon is affected by topographical condition, soil type and climatic factors of different regions, on the whole, the organic carbon density of southeastern region is relatively higher and that of central and western region is relatively lower.
