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８２９• ８４０． Ｍａ Ｈ Ｙ，Ｙａｎｇ Ｘ Ｄ，Ｌü Ｇ Ｈ，Ｈｅ Ｘ Ｍ，Ｚｈａｎｇ Ｘ Ｎ，Ｗａｎｇ Ｘ Ｙ， Ｌｉ Ｙ． Ｗａｔｅｒ ｓｏｕｒｃｅｓ ｏｆ ｄｏｍｉｎａｎｔ ｄｅｓｅｒｔ ｓｐｅｃｉｅｓ ｉｎ ｅｂｉｎｕｒ ｌａｋｅ ｗｅｔｌａｎｄ ｎａｔｕｒｅ ｒｅｓｅｒｖｅ， Ｘｉｎｊｉａｎｇ， Ｃｈｉｎａ．Ａｃｔａ Ｅｃｏｌｏｇｉｃａ Ｓｉｎｉｃａ，２０１７，３７(３) ：８２９• ８４０．

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Soil organic carbon (SOC) represents a large component of the global carbon cycle, and the SOC pool varies in forest ecosystems depending on species composition, growth stage and management practice. In order to accurately evaluate SOC distribution and dynamics in forests in Hunan Province of China, we reviewed, assembled and analyzed a http: / / www.ecologica.cn comprehensive data package collected from (1) published estimates of SOC contents in various forested soil profiles (a total of 277 soil profiles in the province) in the past 15 years (from 2000 to 2014) , (2) four times of forest inventory data from 1983 to 2009 in Hunan忆s forests, (3) long鄄term field measurements in the Key National Observation Station of Central South University of Forestry and Technology in Huitong County, Hunan Province of China over the past 15 years (2000-2014) and (4) field surveys of 59 soil profiles taken from ten typical forest types in the province during the period of 2008 to 2014. All forests in the province were classified into four categories of timber鄄forests, economic鄄forests, bamboo鄄forests and shrub鄄forests. The timber鄄forests were further divided into eight major forest types based on the species composition of the forest stands. The results showed that the arithmetic average of SOC contents ranged from 9.53 to 22.86 g / kg in the four main forest categories, of which the shrub鄄forests had the highest SOC content. The differences of SOC mainly occurred in the 0-40 cm of soil layer among the studied forest groups. SOC density was in the range of 95.44-181.30 tC / hm 2 in the 0-80 cm soil layer, with an average of 137.15 tC / hm 2 in the examined forests. The differences of SOC density among the forest groups declined with the increase of soil depth, and the effect of forest types on variation of SOC density was gradually weakened with the increasing soil depth. From 1983 to 2009, SOC pool (0-80 cm soil depth) increases in Hunan忆 s timber鄄forests with a net increase of 414.86伊10 6 tC and the area weighted average of SOC density increased 10.98 tC / hm 2 in the studied timber鄄forested soils (0-80 cm soil depth) as well. The difference of SOC pool gradually increased with aged stands of timber鄄forests, mainly occurring in Chinese fir (Cunninghamia lanceolata) forests, Masson Pine (Pinus massoniana) forests and broad鄄leaved forests. Among the forest types, natural forest accounted for a large percentage (>50%) of the total SOC storage in Hunan忆 s forests. But the proportion of SOC in plantation forests increased as the plantation areas gradually increased in the studied province. Economic鄄forests, shrub鄄forests and bamboo鄄forests made different contributions to the total SOC pool (0-80 cm soil depth) in Hunan忆s forests, depending upon planting areas, cultivate systems and management practices. The changes in SOC pool in studied forests were closely associated with the alteration of forested area, convention of forest types and land use changes. These changes in terms of forested area and forest type were related to the fo...

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