海南岛热带次生草地生物多样性变化的气候驱动效应  

The climate-driven effects on biodiversity changes in the tropical secondary grasslands of Hainan

作　　者：查苏娜 吴桂林 周璋[1] 吴建辉[1] 张涛 农寿千 陈德祥[1] CHA Suna;WU Guilin;ZHOU Zhang;WU Jianhui;ZHANG Tao;NONG Shouqian;CHEN Dexiang(Research Institute of Tropical Forestry,Chinese Academy of Forestry,Jianfengling Long-term Research Station of Tropical Forest Ecosystem,Guangzhou 510520,China;Nanjing Forestry University,Nanjing 210037,China;Experimental Station of Research Institute of Tropical Forestry,Chinese Academy of Forestry,Jianfeng 572542,China;Hainan Academy of Forestry(Hainan Academy of Mangrove),Haikou 571100,China)

机构地区：[1]中国林业科学研究院热带林业研究所,海南尖峰岭森林生态系统国家野外科学观测研究站,广州510520 [2]南京林业大学,南京210037 [3]中国林业科学研究院热带林业研究所试验站,尖峰572542 [4]海南省林业科学研究院(海南省红树林研究院),海口571100

出　　处：《生态学报》2024年第23期10864-10874,共11页Acta Ecologica Sinica

基　　金：“海南尖峰岭森林生态系统国家野外科学观测研究站”项目;中国科学院战略性先导科技专项(A类)(XDA26010102)。

摘　　要：草地物种多样性与气候密切相关,前人的研究主要集中在北方次生草地生态系统,而南方热带次生草地物种多样性与气候的关系尚不清楚。基于海南岛6个市县43个30 m×30 m热带次生草地样地的物种基本信息,分析海南岛主要热带次生草地植被物种组成与物种多样性指数,结合Worldclim数据库中提取的19个表征温度和降水的气候变量,探究物种多样性与气候因子的关系,揭示海南岛热带次生草地物种多样性的气候驱动因素。结果表明:海南岛热带次生草地物种丰富度与昼夜温差月均值(BIO2)、等温性(BIO_(3))和气温年较差(BIO7)显著正相关(P<0.050);Simpson指数与年均气温(BIO1)、最冷月份最低温度(BIO6)和最冷季度平均温度(BIO11)显著负相关(P<0.050);Shannon-Wiener指数与最冷月份最低温度(BIO6)显著负相关,与气温年较差(BIO7)显著正相关(P<0.050);降水因子(BIO12、BIO13、BIO14、BIO15、BIO16、BIO17、BIO18、BIO19)与海南岛热带次生草地丰富度、Simpson指数和Shannon-Wiener指数均无显著相关关系(P>0.050)。研究结果说明海南岛热带次生草地已经形成了对热带长期高温的气候适应性,当气温出现剧烈波动,或者出现极端低温条件下,热带草地的物种多样性将受到显著的影响。本研究结果可为探索热带次生草地物种多样性对气候的响应研究提供参考依据。Grassland species diversity is closely linked to climate patterns.Prior research has predominantly focused on the ecological systems of northern secondary grasslands,leaving the connection between species diversity and climate in southern tropical secondary grasslands unclear.This study examined the species composition and diversity indices of the primary tropical secondary grassland vegetation in Hainan Island by utilizing the fundamental species information from 43 plots measuring 30m×30m situated in six cities and counties.In conjunction with 19 climate variables characterizing temperature and precipitation obtained from the Worldclim database,the study investigated the correlation between species diversity and climate factors.The findings shed light on the climatic driving forces impacting the diversity of species in tropical secondary grasslands in Hainan Island.The results showed that:the species richness of major tropical secondary grasslands in Hainan Island was significantly positively correlated with the monthly mean diurnal range(BIO2),isothermality(BIO_(3)),and temperature annual range(BIO7)(P<0.050);Simpson index was significantly negatively correlated with annual mean temperature(BIO1),min temperature of the coldest month(BIO6),and mean temperature of the coldest quarter(BIO11)(P<0.050);the Shannon-Wiener index was significantly negatively correlated with the min temperature of the coldest month(BIO6)and significantly positively correlated with the temperature annual range(BIO7)(P<0.050);precipitation factors(BIO12,BIO13,BIO14,BIO15,BIO16,BIO17,BIO18,BIO19)showed no significant correlation with the species richness,Simpson index,and Shannon-Wiener index of major tropical secondary grasslands in Hainan Island(P>0.050).The findings of this study have revealed that the tropical secondary grasslands in Hainan Island have acquired the ability to adapt to the prolonged hot weather conditions characteristic of the tropics.However,when there are sudden significant temperature fluctuations or conditions of

关 键 词：次生草地 物种多样性 温度 降水 

分 类 号：S812[农业科学—草业科学]