Species richness and aboveground carbon stocks in the homegardens of central Kerala, India
Species richness and aboveground carbon stocks in the homegardens of central Kerala, India
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DOI：
10.1016/j.agee.2011.01.006
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发表时间：
2011-03-01
影响因子：
6.6
通讯作者：
Kumar, B. Mohan
中科院分区：
文献类型：
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作者：
Kumar, B. Mohan
具有高农业生物多样性的热带家庭花园具有较高的碳(C)固存潜力，特别是在不断变化的环境下。评估了喀拉拉邦植物区系多样性、丰富度和地上碳储量，以及园地规模对农业生物多样性和碳固存潜力的影响。采用分层随机方法对特里苏、帕拉卡德和马拉普兰县28个村级（地方自治最低单位）的839个家庭花园进行了调查。收集了所有乔灌木的树冠大小、区系组成、株高和胸围（GBH） （bbb20 cm GBH）等信息。利用异速生长关系计算树木的地上碳储量，假设碳占生物量的50%。家庭花园也被划分为小花园（1.2公顷）。共记录到473种，其中乔木208种，灌木86种，草本179种。小型园地的植物区系多样性指数（0.64、0.41和0.46）、物种丰富度和树木密度（每公顷）最高。然而，大型家庭花园每个花园有更多的茎。平均地上常绿碳储量在16 ~ 36 Mg ha（-1）之间，小型园地单位面积碳储量高于大中型园地。这其中隐含着碳封存和农业生物多样性保护的潜力，特别是通过小型家庭菜园。(C) 2011 Elsevier B.V.版权所有
Tropical homegardens with high agrobiodiversity have high potential for carbon (C) sequestration, especially under changing environments. Floristic diversity, richness, and aboveground C stocks and how size of homegardens influence agrobiodiversity and C sequestration potential were assessed in the Kerala homegardens. A total of 839 homegardens in 28 panchayaths (lowest unit of local self-government) of Thrissur, Palakkad, and Malappuram districts were surveyed through a stratified random process. Information was gathered on holding size, floristic composition, plant height, and girth at breast height (GBH) of all trees and shrubs (>20 cm GBH). Aboveground C stocks of trees were computed using allometric relationships, assuming C as 50% of biomass. The homegardens were also classified into small (1.2 ha). In total, 473 species were recorded, of which 208 were trees (>20 cm GBH), 86 shrubs, and 179 herbs. Simpson's floristic diversity index (0.64, 0.41, and 0.46 for a subset of small, medium, and large homegardens, respectively), species richness, and tree density (per hectare) were highest for small-sized holdings. Large-sized homegardens, however, had more stems per garden. Average aboveground standing stocks of C ranged from 16 to 36 Mg ha(-1), with small homegardens having higher C stocks on unit area basis than large- and medium-sized ones. Implicit in this is the potential for C sequestration and agrobiodiversity conservation, especially by small homegardens. (C) 2011 Elsevier B.V. All rights reserved.