生态学报2023，Vol.43Issue(23)：9891-9899,9.DOI:10.20103/j.stxb.202209132611
祁连山排露沟流域青海云杉天然更新与土壤水热的关系
Relationship between natural regeneration of Picea crassifolia and soil moisture and temperature in Pailugou watershed of Qilian Mountains
摘要
Abstract
Picea crassifolia is an established species of forest ecosystem in Qilian Mountains,and its natural regeneration is of great significance for maintaining forest ecosystem function in Qilian Mountains.In this study,the natural regeneration of P.crassifolia forest in Pailugou watershed of Qilian Mountains was taken as the research object.The soil temperature and moisture of 0-40cm soil layer at an altitude of 2700-3300m were measured from June to September 2021,and the natural regeneration of the sample plots was examined by tally in mid-July.The natural regeneration was divided into seedling(first age class)stage and sapling(second age class)stage,and the differences in diameter at breast height(DBH)and plant height of new seedlings at different altitudes were explored by analysis of variance(ANOVA).Then,a regression model was established to fit the relationship between DBH and plant height of new seedlings,soil temperature and soil moisture of each layer,and to explore the response of DBH and plant height of new seedlings to soil temperature and soil moisture.The results showed that:(1)the DBH and plant height of new seedlings decreased with the increase of altitude.There were significant differences in DBH between 2700m seedlings and 3300m seedlings(P＜0.05).The height of seedlings and saplings at 2700m and 2800m was significantly different from that at 3300m(P＜0.05).There was no significant difference in DBH of saplings at different altitudes,indicating that the DBH of new seedlings was less sensitive to altitude than height of new seedlings.(2)The DBH and plant height of new seedlings were correlated with soil temperature and soil moisture positively,while correlated with soil moisture negatively.The correlation coefficient between DBH of seedlings and soil temperature and moisture at 20cm was the highest.The correlation coefficient between DBH of saplings and soil temperature and moisture at 40cm was the highest.The correlation coefficient between height of saplings and soil temperature and moisture of at 40cm was the highest.(3)The regression model showed that the utilization patterns of soil water and temperature by DBH and plant height of seedlings were same,while the utilization patterns of soil temperature and soil moisture by DBH and plant height of saplings were different.(4)With increase of age class,the main factor affecting the growth of P.crassifolia natural regeneration gradually changed from soil temperature to soil moisture,and the response of DBH of new seedlings to soil water and temperature decreased gradually with the increase of age class.关键词
青海云杉/天然更新/土壤温度/土壤水分Key words
Picea crassifolia/natural renewal/soil temperature/soil moisture引用本文复制引用
刘济萌,刘贤德,马瑞,赵维俊,敬文茂,赵永宏..祁连山排露沟流域青海云杉天然更新与土壤水热的关系[J].生态学报,2023,43(23):9891-9899,9.基金项目
国家自然科学基金项目(32060247) （32060247）
省级林业和草原自列科技项目(2022kj005) （2022kj005）
国家自然科学基金项目(U21A20468) （U21A20468）
甘肃省中央引导地方科技发展资金项目(22ZY2QG001) （22ZY2QG001）
