Influence of Karst Rocky Desertification on Soil Carbon Pool in Guizhou Karst valley region

GUO Hong-yan; CUI Ming; ZHOU Jin-xing; DAN Xin-qiu; DING Fangjun; LV Xiang-hai

The paper takes karst valley region as study area to assess the influence of rocky desertification management on soil carbon pool for the first time. We selected the Huajiang karst gorge in Guanling County of Guizhou Province as the sampled field, which is a typical rocky desertification region, soil organic and inorganic carbon content of the soil samples from non-rocky desertification land and rocky desertification land were tested respectively, and carbon densities were calculated. The results showed that: (1) the average soil carbon storage of non-rocky desertification land is higher than that of rocky desertification land, and the average carbon storage in soil profiles of rocky desertification land has less relation with the degree of rocky desertification than with vegetation type and soil depth; (2)the average carbon density decreases as the seriousness of rocky desertification increases, none>potential>slight>moderate>serious>significantly serious; (3)soil quality was improve by the Rocky Desertification Comprehensive Management Project in the past years, according to the areas of non-rocky desertification land and rocky desertification changed in Guanling County, the total soil carbon storage increased by 724 t per square kilometer, in which, the value of organic carbon increased 513600 yuan per square kilometer.

1. School of Soil and Water Conservation, Beijing Forestry University, Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, Beijing 100083, China

2. Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China

3. Central South Forest Inventory and Planning Institute of State Forestry Administration, Changsha 410014, Hunan, China

4. Guizhou Provincial Academy of Forestry, Guiyang 550011, Guizhou, China

5. China International Engineering Consulting Corporation, Beijing 100048, China

Received Date: 2013-06-20

Abstract: The paper takes karst valley region as study area to assess the influence of rocky desertification management on soil carbon pool for the first time. We selected the Huajiang karst gorge in Guanling County of Guizhou Province as the sampled field, which is a typical rocky desertification region, soil organic and inorganic carbon content of the soil samples from non-rocky desertification land and rocky desertification land were tested respectively, and carbon densities were calculated. The results showed that: (1) the average soil carbon storage of non-rocky desertification land is higher than that of rocky desertification land, and the average carbon storage in soil profiles of rocky desertification land has less relation with the degree of rocky desertification than with vegetation type and soil depth; (2)the average carbon density decreases as the seriousness of rocky desertification increases, none>potential>slight>moderate>serious>significantly serious; (3)soil quality was improve by the Rocky Desertification Comprehensive Management Project in the past years, according to the areas of non-rocky desertification land and rocky desertification changed in Guanling County, the total soil carbon storage increased by 724 t per square kilometer, in which, the value of organic carbon increased 513600 yuan per square kilometer.

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Reference (18)

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Influence of Karst Rocky Desertification on Soil Carbon Pool in Guizhou Karst valley region

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