干旱生境下3种植物叶凋落物分解动态特征

doi:10.13866/j.azr.2019.04.16

Abstract

Abstract: In this study,Populus euphratica,Tamarix ramosissima and Glycyrrhiza inflate in the Tarim Basin were taken as the research objects to analyze the dynamic decomposition of foliar litters of three plant species in arid habitats.The results showed that:① The residual rates of foliar litters of P.euphratica and G.inflata were 48.93% and 38.07% after a decomposition for 810 days,and the residual rate of foliar litters of T.ramosissima was 69.55% after a decomposition for 630 days.The decomposition time affected significantly the residual rates of foliar litters of the three plant species.The treatments affected significantly the residual rates of foliar litters of P.euphratica and G.Inflate.② The k values of foliar litters of the three plant species were significantly affected by understory-forest gap treatment (P<0.05),and the k values were in an order of k_{forest gap} > k_understory,k_G.inflate > k_P.euphratica > k_{T.ramosissima},the t_0.95 values of P.euphratica and G.inflate were in ranges of 9.15-9.48 a and 6.75-7.03 a during 810-day decomposition.After a 630-day decomposition,the t_0.95 value of T.ramosissima was in a range of 13.82-15.05 a.③ The effects of the decomposition time and treatments on the release process of C,N and P were different because of the difference of plant species.There was a release-accumulation-release process of C content of the three plant species,a process of release-accumulation of N content of T.ramosissima and G.inflata,and also a process of accumulation-release-accumulation of P content of P.euphratica understory during the observation period; ④ The k-value was significantly correlated with decomposition time,total nitrogen,the remaining amount of mass,total phosphorus,lignin,ratio of lignin and nitrogen (P<0.01),and soil moisture,total carbon,C/N were significantly correlated with k_{forest gap} and k_understory.Changes of micro-habitats (understory and forest gap) in arid areas have significant influence on litter decomposition,and litter quality and soil moisture play a leading role in litter decomposition.

Key words: litter, decomposition, forest gap, understory, arid habitats, Shaya County, Xinjiang

YANG Jing-jing, ZHOU Zheng-li, LYU Rui-heng, LIANG Ji-ye, WANG Xiong. Dynamic Decomposition of Foliar Litters of Three Plant Species in Arid Habitats[J].Arid Zone Research, 2019, 36(4): 916-923.

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Dynamic Decomposition of Foliar Litters of Three Plant Species in Arid Habitats

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