本文選題：生物量 + 環(huán)境因子　； 參考：《生態(tài)環(huán)境學(xué)報》2017年06期

【摘要】：錫林河流域是內(nèi)蒙古典型草原最具代表性的區(qū)域,了解植被群落生物量特征及其與環(huán)境因子的關(guān)系,對于合理利用草地資源,科學(xué)制定合理的放牧政策具有重要的指導(dǎo)意義。以錫林河流域草原為研究對象,基于樣方調(diào)查和實驗數(shù)據(jù),運用相關(guān)分析、通徑分析、決策系數(shù)分析研究了環(huán)境因子對地上生物量、地下生物量以及根冠比的直接與間接影響。結(jié)果表明,(1)流域地上生物量、地下生物量、根冠比均值分別為117.60 g?m~(-2)、1 548.69 g?m~(-2)、14.55;變異系數(shù)均在50%左右,屬于中等變異程度。(2)影響草地地上生物量、地下生物量以及根冠比的環(huán)境因子不盡相同,相關(guān)分析表明,地上生物量與海拔、生長季降水、生長季平均氣溫具有顯著相關(guān)關(guān)系(P0.05);地下生物量與海拔、生長季降水、生長季平均氣溫、年均溫、0℃積溫、有機(jī)碳含量、全氮含量、飽和含水率、田間持水率、干容重呈顯著相關(guān)關(guān)系(P0.05);根冠比與土壤有機(jī)碳與全氮含量、0~10 cm層土壤飽和含水率和田間持水率均達(dá)到顯著相關(guān)水平(P0.05)。(3)海拔和4—7月降水對地上生物量具有間接影響,而4—7月平均氣溫則對其具有直接影響,4—7月平均氣溫為主要決策變量。(4)4—7月降水量、年平均氣溫、土壤有機(jī)碳含量對地下生物量主要產(chǎn)生直接影響,是控制地下生物量的主要環(huán)境因子。
[Abstract]:Xilin River Basin is the most representative region of typical grassland in Inner Mongolia. Understanding the biomass characteristics of vegetation community and its relationship with environmental factors has important guiding significance for rational utilization of grassland resources and scientific formulation of rational grazing policies. The direct and indirect effects of environmental factors on aboveground biomass, underground biomass and root-shoot ratio were studied by correlation analysis, path analysis and decision coefficient analysis based on sample investigation and experimental data. The results showed that the mean values of aboveground biomass, belowground biomass and root-shoot ratio were 117.60 g / m ~ (-1) and 1 548.69 g / m ~ (-1) ~ (2) respectively, and the coefficients of variation were about 50%, belonging to a moderate degree of variation, which affected the aboveground biomass of grassland. The environmental factors of underground biomass and root / shoot ratio are different. Correlation analysis shows that aboveground biomass has a significant correlation with altitude, precipitation in growing season and average temperature in growing season, while underground biomass has significant correlation with altitude and precipitation in growing season. Average temperature of growing season, accumulated temperature of 0 鈩，

本文編號：1880336