福建农业科技2023，Vol.54Issue(11)：7-16,10.DOI:10.13651/j.cnki.fjnykj.2023.11.002
增温及隔离降雨对杉木不同序级细根形态和化学计量学性状的影响
Effects of Soil Warming and Precipitation Exclusion on the Morphological and Stoichiometric Traits of Fine Roots of Different Orders in Cunninghamia lanceolata
摘要
Abstract
In order to understand the responses of fine root morphological and stoichiometric traits to the interaction of warming and drought,the two-factor experiment of soil warming(no warming and 5℃ warming)and precipitation exclusion(no precipitation exclusion and 50％precipitation exclusion)with Cunninghamia lanceolata seedlings as the materials was carried out in the National Field Scientific Observation and Research Station of Forest Ecosystem in Sanming of Fujian.There were four treatments,namely the control group(CT),soil warming(W),precipitation exclusion(P),and soil warming+precipitation exclusion(WP).The morphological and stoichiometric traits of fine roots in the first three orders were measured after one year of treatment.The results showed that there was no signif-icant interaction between temperature enhancement and precipitation exclusion on the morphological traits of fine roots.The main effect of temperature enhancement had no significant effect on the diameter of fine roots(RD),but significantly reduced the specific root length of fine roots(SRL,especially the first-order root)and the specific sur-face area of fine roots(SRA),while significantly increased the fine root tissue density(RTD).The main effect of precipitation exclusion only significantly reduced the specific root length(SRL),but had no significant effect on the root diameter(RD),specific surface area(SRA)and root tissue density(RTD).The effect of temperature enhance-ment,precipitation exclusion and their interactions had significant effects on the contents of carbon and nitrogen in fine roots and the carbon-nitrogen ratio.Compared with CT,the P treatment resulted in a significant decrease in car-bon content and carbon-nitrogen ratio of fine roots in first and second order.The nitrogen content of fine roots in each order increased significantly under W and WP treatments,while the carbon-nitrogen ratio of fine roots decreased sig-nificantly.Under the effect of temperature enhancement and precipitation exclusion,the fine roots of Cunninghamia lanceolata may enhance the physiological absorption ability(high content of nitrogen),but weaken the ability to ex-plore nutrients(low SRL and SRA).The results of this study were helpful to further understand the ecological strat-egies of the fine roots of Cunninghamia lanceolata to cope with the environmental stress in the subtropical regions in the context of global climate change.关键词
细根/增温/隔离降雨/根序/形态性状/化学计量学性状Key words
Fine root/Warming/Precipitation exclusion/Root order/Morphological traits/Stoichiometric traits分类
农业科技引用本文复制引用
陈玉琪,蔡世锋,罗素珍,陈光水..增温及隔离降雨对杉木不同序级细根形态和化学计量学性状的影响[J].福建农业科技,2023,54(11):7-16,10.基金项目
国家自然科学基金重点项目(31830014). （31830014）
