摘要
种间关联性对于研究群落结构、演化及分类具有重要意义,并在很大程度上表现了群落演替的趋势和进程。为了研究生态种组的光合生理特征及其在演替过程中的变化,在海南岛热带山地雨林3个演替阶段(前期、中期和后期)的样地内测定群落的种间联结性,并利用种间联结性划分出生态种组;应用Li-6400光合测定系统测量各生态种组在不同演替过程的最大光合速率(maximal photosynthesis rate,Pmax)和水分利用效率(WUE)。结果表明:演替前期和演替中期样地的物种总联结性指数VR分别为1.038和1.232,树种间总体呈正联结,但不显著;演替后期样地的物种总体联结性指数VR为2.238,群落总体联结性呈显著正相关。群落总体正关联性随着演替的进行而加强。每个演替阶段的种群可分为3个生态种组;第1生态种组内的物种两两之间均呈显著正联结;第2生态种组中虽然个别种之间联结性不显著,但大多数物种两两之间也形成显著正联结,某些种与第1生态种组中的种形成显著负联结;第3生态种组内种对间两两彼此独立。各生态种组的光合能力随演替的进行而逐渐降低;第1生态种组演替前期的最大光合速率显著高于中后期(P<0.05);第2生态种组前期的最大光合速率显著高于后期(P<0.05)。不同演替阶段,不同生态种组水分利用效率差异不显著(P>0.05)。光合能力是决定生态种组的内在因素。
Interspecific association is of great importance to research of community structure, evolution and classification. And interspecific association shows in a large part trends and processes of community succession. To study photosynthetic characteristics of the ecological species groups and changes in succession, interspecific associations were measured in plots of 3 successional stages （early stage, middle stage and late stage） of Hainan Island tropical rain forest, and were used to divide ecological species groups, whose maximal photosynthesis rate （Pmax） and water use efficiency （WUE） were measured using a Li-6400 portable photosynthesis system. The results showed that overall association indexes （VR） of early successional stage and middle successional stage were 1.038 and 1.232, and the positive associations were present among overall woody species of the communities during two successional stages （P〉0.05）. Overall association index （VR） of late successional stage was 2.238, and the positive association was present among overall woody species of the communities during the late successional stage （P〈0.05） . The positive association among overall woody species of the communities became stronger with the succession process. Communities of 3 successional stages were divided to 3 ecological species groups. And species of the first ecological species group were significantly and positively associated with each other; most species of the second ecological species group were also significantly and positively associated with each other, but some of them were not, and several of them were significantly and negatively associated with species from the first ecological species group; species of the third ecological species group were independent. Values of maximal photosynthesis rate （Pmax） of all 3 ecological species group gradually decreased in the progress of succession. Pmax of the first ecological species group in early successional stage was significantly high than that in middle
出处
《生态环境学报》
CSCD
北大核心
2017年第4期576-581,共6页
Ecology and Environmental Sciences
基金
中央级公益性科研院所基本科研业务费专项"气候变化背景下西藏高原植被格局变化及气候风险研究"
关键词
热带山地雨林
种间联结
生态种组
光合能力
水分利用效率
tropical montane rain forest
interspecific association
ecological species groups
photosynthetic capacity
water use efficiency
