Biomass accumulation and carbon sequestration in an age-sequence of Zanthoxylum bungeanum plantations under the Grain for Green Program in karst regions, Guizhou province
Biomass accumulation and carbon sequestration in an age-sequence of Zanthoxylum bungeanum plantations under the Grain for Green Program in karst regions, Guizhou province
复制标题
贵州省喀斯特地区退耕还林花椒人工林年龄序列生物量积累与固碳
DOI：
10.1016/j.agrformet.2015.01.004
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发表时间：
2015-04-15
影响因子：
6.2
通讯作者：
Li, Fushan
中科院分区：
文献类型：
--
作者：
Cheng, Jianzhong;Lee, Xinqing;Li, Fushan
在环境退化中确保生态安全，始终是中国的头等大事。在退耕还林工程(GGP)下，贵州省喀斯特地区数百万公顷的农田被改造成花椒种植园，以遏制和扭转“石漠化”。本研究的目的是估算4个不同年龄(1年、4年、7年和10年生)的白叶杨林分的生物量增量和碳积累，以及碳储量在不同生物量组分和土壤深度之间的分布。4种不同年龄林分的总生物量分别为0.05、6.76、12.22和16.71 mg ha(-1)。与该地区其他植物相比，白花蛇舌兰人工林具有较大的生物量积累能力。白花蛇舌兰各成分的C含量在40.47%~48.64%之间，平均值为44.67%。使用标准系数(50%)将生物质转化为碳储量会导致10%的高估。表层(0~30 cm)土壤有机碳储量由1年生林分的75.22mgCha(-1)增加到10年生林分的80.06mgCha(-1)，并随土壤深度的增加而降低。生态系统碳储量随着林龄的增加而增加，平均分别为75.24、79.79、84.43和87.62 mg C ha(-1)，其中90%以上储存在土壤中。我们的研究表明，在人工林管理实践中，保护表层土壤中的有机碳在改善碳汇方面起着至关重要的作用。贵州省人工林面积和年生物量碳累积率数据表明，2010年净碳汇为6.35×10(6)mg，相当于当年能源消耗碳排放的4.92%的补偿。除了随着时间的推移增加碳贮量，大规模种植白花丹还具有修复中国西南部喀斯特地区严重退化土壤的潜力。(C)2015爱思唯尔B.V.保留所有权利。
Ensuring ecological security in the environmental degradation has always been a top priority in China. Under the Grain for Green Program (GGP), millions of hectares of farmland in the karst region of Guizhou province have been converted into Zanthoxylum bungeanum plantations in order to arrest and reverse "rocky desertification". The aim of this study was to estimate biomass increment and carbon accumulation in four different aged (1-, 4-, 7- and 10-year-old) Z. bungeanum stands, as well as the distribution of carbon stock among the various biomass components and soil depths. The total plant biomass measured for the four stands of different ages was 0.05, 6.76, 12.22, and 16.71 Mg ha(-1), respectively. Compared with other plant species in the region, Z. bungeanum plantations has a larger capacity for accumulating biomass. The C content in components of Z. bungeanum tree ranged from 40.47% to 48.64% with the mean value of 44.67%. The use of the standard coefficient (50%) in converting biomass into C storage results in 10% overestimation. Soil organic carbon (SOC) storage at the top soil (0-30 cm) increased from 75.22 Mg C ha(-1) in 1-year-old stand to 80.06 Mg C ha(-1) in 10-year-old stand, and decreased with increasing soil depth for each stand age. Total ecosystem C storage increased with plantation age, averaging 75.24, 79.79, 84.43, and 87.62 Mg C ha(-1), respectively, of which more than 90% was stored in the soil. Our study suggests that the protection of SOC in surface soils during plantation management practices plays a crucial role in improving the C sequestration. Data of plantation area and annual biomass C accumulation rate (under the GGP in Guizhou province) indicate a net C sink of 6.35 x 10(6) Mg in 2010, corresponding to a 4.92% compensation of C emission from energy consumption in that year. Besides increasing C storage over time, the large-scale planting of Z bungeanum has the potential of restoring severely degraded soils in the karst region of SW China. (C) 2015 Elsevier B.V. All rights reserved.