黄土高原杨树人工林的细根生物量与碳储量研究

doi:10.11924/j.issn.1000-6850.casb15080071

中国农学通报 ›› 2015, Vol. 31 ›› Issue (35): 146-151.doi: 10.11924/j.issn.1000-6850.casb15080071

所属专题：园艺

• 资源环境生态土壤气象 • 上一篇下一篇

黄土高原杨树人工林的细根生物量与碳储量研究

闫美芳,王璐,郭楠

太原理工大学环境科学与工程学院,太原理工大学环境科学与工程学院,太原理工大学环境科学与工程学院

收稿日期:2015-08-13 修回日期:2015-09-20 接受日期:2015-09-24 出版日期:2015-12-18 发布日期:2015-12-18
通讯作者: 闫美芳
基金资助:
太原理工大学人才引进项目“杨树人工林的地下固碳机理研究”(tyut-rc201111a)。

Study on Fine root biomass and C stock in a poplar plantation in loess plateau

闫美芳, and

Received:2015-08-13 Revised:2015-09-20 Accepted:2015-09-24 Online:2015-12-18 Published:2015-12-18

摘要/Abstract

摘要： 为了解细根生长、周转及其对土壤碳库的贡献，以太原地区杨树人工林(Populus tomentosa)为研究对象，采用连续取土样法及分解袋法，研究了细根(＜ 2 mm)的垂直分布、季节动态、年生产量及碳储量。结果表明：0~40 cm土层细根生物量为241.8 g/m2，其中活细根生物量为168.0 g/m2，约占细根总生物量的69.5%。细根主要集中于0~10 cm土层，且随土层加深而递减。细根生物量还具有明显的季节变化，最大值出现在8月，最小值出现在4月。细根年分解量为35.3 g/m2，年死亡量为98.2 g/m2。细根年生产量估计为216.6 g/m2，年周转率为1.29次。0~40 cm土层细根总碳储量为97.4 g?C/m2，每年由于细根死亡向土壤碳库输入的碳量约为39.6 g?C/m2。土壤全氮含量和土壤含水量是影响细根垂直分布的主要因素，而细根季节动态与土壤水分及气候特点密切相关。由于本研究区地处黄土高原，土壤水分短缺是导致细根生产量偏低的主要原因，且影响细根周转及其向土壤有机碳库的碳输入。

关键词: 灰色关联度, 灰色关联度, 农艺性状

Abstract: In order to explore fine root growth, turnover, and its contribution to soil C pool, vertical distribution, seasonal variation, annual production and C stock of fine roots (＜ 2 mm) were investigated in a poplar (Populus tomentosa) plantation in Taiyuan using sequential soil coring method and litter bag technique. The results showed that fine root biomass at 0-40 cm soil depth was 241.8 g/m2, and the live fine root biomass was 168.0 g/m2, roughly accounting for 69.5% of total biomass. Fine roots distributed mainly in 0-10 cm soil layer and decreased with soil depth. Furthermore, fine root biomass showed a clearly seasonal variation, with the highest occurring in August and the lowest in April. Annual decomposition of fine root was 35.3 g/m2, and annual mortality was 98.2 g/m2. Annual fine root production was estimated to be 216.6 g/m2, and annual turnover rate was 1.29 times/a. Total C stock of fine roots at 0-40 cm soil depth was 97.4 g?C/m2, and annual input to soil C pool was 39.6 g?C/m2 due to fine root mortality. Soil total N and soil water contents were main factors controlling vertical distribution of fine roots, while its seasonal variation was closely related to soil water content and climate characteristic. Since our study site was located in Loess Plateau, lower fine root production in this study resulted primarily from soil water shortage, which also affected fine root turnover and its C input to soil organic C pool.

中图分类号:

Q948.1

闫美芳,王璐,郭楠. 黄土高原杨树人工林的细根生物量与碳储量研究[J]. 中国农学通报, 2015, 31(35): 146-151.

闫美芳, and . Study on Fine root biomass and C stock in a poplar plantation in loess plateau[J]. Chinese Agricultural Science Bulletin, 2015, 31(35): 146-151.

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黄土高原杨树人工林的细根生物量与碳储量研究

Study on Fine root biomass and C stock in a poplar plantation in loess plateau

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