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[1]XIE Yuli,CHEN Yunming,TANG Yakun,et al.Impact of Aboveground Litterfall on Soil Respiration in the Pinus tabulaeformis and Hippophae rhamnoides Plantations[J].Research of Soil and Water Conservation,2017,24(06):52-61.

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Impact of Aboveground Litterfall on Soil Respiration in the Pinus tabulaeformis and Hippophae rhamnoides Plantations

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 06 Page number: 52-61 Column: Public date: 2017-11-24

Title:: Impact of Aboveground Litterfall on Soil Respiration in the Pinus tabulaeformis and Hippophae rhamnoides Plantations

Author(s):: XIE Yuli¹, CHEN Yunming^1,2, TANG Yakun², WU Xu¹, WEN Jie³; 1. Research Center of Institute of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100, China

Keywords:: litterfall; plantation; soil respiration; soil temperature; soil water content

CLC:: S718.55

DOI:: -

Abstract:: The effects of surface litterfall on the soil respiration (R_s) were studied base on observation of R_s, soil temperature(T) and soil water content (W) at 5 cm depth under natural group (with litterfall) and exclusive group (without litterfall) treatments in Pinus tabulaeformis and Hippophae rhamnoides plantations in the hilly Loess Plateau region. Two plots (20 m×20 m) were established in these two plantations with 5 sampling points randomly set up in each plot. R_s, T and W were simultaneously monitored by LI-8100 soil flux system from June 2015 to May 2016 in these plots. The results showed that:(1) the seasonal and daily variation of R_s in the two plantations under natural group exhibited unimodal curve, and the annual average R_s in H.rhamnoides plantation[2.10 μmol/(m²·s)] was significantly higher than that in P.tabulaeformis plantation[1.56 μmol_/(m²·s),p<0.05]. After removal of the litterfall, seasonal and daily dynamic of R_s in the two plantations were similar to that in natural group, and the annual average R_s in exclusive group did not exhibit significant differences for both forest stands; (2) the annual average R_s in natural group was significantly higher than in exclusive group[1.58 μmol_/(m²·s),p<0.05] for H.rhamnoides plantation, with a contribution of 15.81% occupied by litterfall respiartion; however, no significant difference of annual average R_s between natural and exclusive group was observed in P.tabulaeformis plantation,and the contribution of litterfall to soil respiration was only 1.61%; (3) Rs under natural and exclusive groups were both exponentially correlated with T and negative linearly correlated with W on daily and seasonal scales in these two plantations (p<0.05); T and W (8.01%~66.44%) together could better explain the variation of R_s than T or W alone (0.05%~37.82%) in both plantations under natural and exclusive group; litterfall significantly enhanced both the temperature sensitivity of R_s and R_s amount in H.rhamnoides plantation, but only significantly improved temperature sensitivity of R_s in the P.tabulaeformis plantation. As an important tree species for soil and water conservation and ecological restoration in the hilly Loess Plateau region, the P.tabulaeformis was more conducive to the improvement of carbon sequestration function of forestland in the region.

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