生态学杂志2018，Vol.37Issue(4)：981-986,6.DOI:10.13292/j.1000-4890.201804.038
油茶-鼠茅草复合系统细根空间分布及地下竞争
Spatial distribution of fine roots and underground competition in Camellia oleifera-Vulpia myuros intercropping system
摘要
Abstract
Using methods of field stratified excavation and image scanning,the spatial distribution of biomass and morphology of fine root (≤ 1 mm) of Camellia oleifera and Vulpia myuros in Camellia oleifera-Vulpia myuros intercropping system was examined.The underground competition between those two species was quantified by the niche overlap formula proposed by Levins.The results showed that the fine root biomass of C.oleifera was 1.37 times as high as that of V.myuros,with average fine root biomass of C.oleifera and V.myuros being 0.52 and 0.38 mg·cm-3,respectively.In the horizontal direction,fine root biomass of C.oleifera decreased with increasing distance from trees,while the root length density and specific root length of C.oleifera increased with the increases of distance from trees.Fine root biomass of V.myuros decreased with the increases of distance from trees,and the root length density and specific root length showed an even distribution.The root length density of V.myuros was greater than that of C.oleifera at different distances from trees,whereas fine root biomass and competition index of C.oleifera were greater than that of V.myuros except for the distance 90 cm.In the vertical direction,fine root biomass of C.oleifera first increased and then decreased with the deepening of soil layer,and the root length density increased with the soil layer,while the specific root length was evenly distributed.The fine root biomass and root length density of V.myuros decreased with the deepening of the soil layer,while the specific root length increased with the soil layer.Except for the 0-10 cm layer,the fine root biomass and competition index of C.oleifera was greater than that of V.myuros.Ourresults indicated that fine roots of C.oleifera had higher plasticity to avoid competition and maximize uptake of soil resources in the intercropping system.关键词
油茶/鼠茅草/细根/种间竞争Key words
Camellia oleifera/Vulpia myuros/fine root/interspecific competition.引用本文复制引用
丁怡飞,曹永庆,姚小华,吴鹏飞,龚洪恩,傅松玲,张平安..油茶-鼠茅草复合系统细根空间分布及地下竞争[J].生态学杂志,2018,37(4):981-986,6.基金项目
浙江省省院合作林业科技项目“浙江省油茶林地高效复合经营技术研究与示范”(2014SY03)资助. （2014SY03）
