冷箭竹更新幼龄无性系种群生物量的研究

A STUDY ON THE CLONAL POPULATION BIOMASS OF YOUNG BASHANIA FANGIANA AFTER NATURAL REGENERATION

本文应用构件生物种群理论研究了卧龙自然保护区大熊猫主要栖息地的冷箭竹自然更新幼龄无性系种群的生物量结构，并探讨了种群生物量与生境条件的关系。结果表明：冷箭竹自然更新种群生物量平均为495．962kg／ha，各器官生物量的排序为竹秆＞竹枝＞根系＞竹叶＞地下茎，不同龄级生物量表现出正态分布格局，3、4、5、6年生生物量之和达362、393kg／ha，占总量的80．29％，1、2年生和7、8、9、10年生生物量分别仅占12．97％和6．94％．三种林分类型中，铁杉＋糙皮桦－冷箭竹林内冷箭竹种群生物量最大，其次是岷江冷杉－冷箭竹林，铁杉＋红桦－冷箭竹林最低；冷箭竹种群生物量的垂直分布格局呈现出海拔3000m以下，随着海拔高度的上升而递增，3000m以上则趋于下降的变化规律。

Based 0n the m0dular organism population theory and studied on the clonal population biomass structure of young Bashania fangiana after natural regenerati0n in the Giant Panda's habitat of W0long Nature Reserve, meantime,analyzed the relati0nship of population biomass and its environment conditions, the result sh0wed that the cl0nal population biomass of young B. fangiana was 495. 962 kg/ha, the order of organ biomass was as follows: stem> branch> ro0ts>leaf> undergroun - stem, the distributi0n laws of different age -class bambo0 biomasses showed the normal distribution pattem. the total biomasses of three - year bambo0, four- year 0nes, five -year ones and six - year ones were 362. 393 kg/ha and 80. 29 per cent; but the percentage 0f one -year bambo0 and two-year ones and seven-year ones 1 eight -year 0nes ` nine-year ones and ten- year ones were l2. 97% and 8.64% respectively. In three forest types, the hightest biomasses 0f B. fangiana was Tusga chinensis + Betula utilia - B. fangiana forest, the second was AUes faxoniana - B. Fangiana forest,T. chinensis+B. ablo-sinensis-B- fangiana forest; The clonal populati011 biomasses of B. fangiana was increased with the altitude between25OO and 3OOO metres,but it was declined above 3000 metres.