Leaf litterfall, fine root production and turnover in four major tree species of the semi-arid region of India
Leaf litterfall, fine root production and turnover in four major tree species of the semi-arid region of India
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DOI：
10.1007/s11104-009-0027-9
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发表时间：
2010-01-01
期刊：
影响因子：
4.9
通讯作者：
Mohapatra, Kamal Prasad
中科院分区：
文献类型：
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作者：
Jha, Pramod;Mohapatra, Kamal Prasad
凋落物和细根生产是森林生态系统碳和养分循环的主要途径。对印度半干旱地区4种主要树种(银合欢、尼罗相思、印扎、菊花)下表层土壤(0~30 cm)的凋落物、细根质量、生产量和周转率进行了调查。4个树种的落叶落叶量均呈单峰型，具有明显的季节性。银合欢和尼罗相思的落叶量在9~12月份最大，印扎和菊花的落叶量在2~5月份最多。4个树种的年落叶落叶量从3.3 mg ha(-1)(银合欢)到8.1 mg ha(-1)(杨梅)。四种树种细根生物量均有明显的季节变化。细根产量以菊花(171 g m(-2)y(-1))最高，其次是印扎(169 g m(-2)y(-1))、尼罗罗相思(106 g m(-2)y(-1))和银合欢(79 g m(-2)y(-1))。细根生物量在雨季后出现季节性高峰，冬夏枯季降至最低值。细根周转率的变化范围为0.56~0.97y(-1)，其大小顺序为印扎、银合欢、菊花、相思。研究结果表明，菊花和印扎具有较强的立地生产力维持能力，表现为较大的落叶量和细根产量。
Litterfall and fine root production is a major pathway for carbon and nutrient cycling in forest ecosystems. We investigated leaf litterfall, fine-root mass, production and turnover rate in the upper soil (0-30 cm) under four major tree species (Leucaena leucocephala, Acacia nilotica, Azadirachta indica, Prosopis juliflora) of the semi-arid region of India. All the four tree species showed an unimodal peak of leaf litterfall with distinct seasonality. Leucaena leucocephala and Acacia nilotica had maximum leaf litterfall between September and December while Azadirachta indica and Prosopis juliflora shed most of their leaves between February and May. Annual leaf litterfall of the four species ranged from 3.3 Mg ha(-1) (Leucaena leucocephala) to 8.1 Mg ha(-1) (Prosopis juliflora). Marked seasonal variations in amount of fine root biomass were observed in all the four tree species. Fine root production was maximum in Prosopis juliflora (171 g m(-2) y(-1)) followed by Azadirachta indica (169 g m(-2) y(-1)), Acacia nilotica (106 g m(-2) y(-1)) and Leucaena leucocephala (79 g m(-2) y(-1)). Fine root biomass showed a seasonal peak after the rainy season but fell to its lowest value during the winter and dry summer season. Fine root turnover rate ranged from 0.56 to 0.97 y(-1) and followed the order Azadirachta indica > Leucaena leucocephala > Prosopis juliflora > Acacia nilotica. The results of this study demonstrated that Prosopis juliflora and Azadirachta indica had greater capability for maintaining site productivity as evidenced from greater leaf litterfall and fine root production.