黄土丘陵区不同演替阶段生物结皮对土壤CO2通量的影响

ISWC OpenIR > 水保所知识产出(1956---)

	黄土丘陵区不同演替阶段生物结皮对土壤CO2通量的影响
其他题名	Effects of biological soil crust at different succession stages in hilly region of Loess Plateau on
	王爱国; 赵允格; 许明祥; 杨丽娜; 明姣
	2013
发表期刊	应用生态学报
卷号	24 期号:03 页码:659-666
摘要	生物结皮是土壤表面具有光合活性的致密复合层,是土-气界面CO2通量的影响因子之一.本文采用改进的Li-8100土壤碳通量测量系统,研究了黄土丘陵区退耕地上不同演替阶段生物结皮对土壤CO2通量的影响.结果表明:光照条件下,生物结皮土壤CO2通量较除去生物结皮显著下降,其中藻结皮和藓结皮分别下降了92%和305%;生物结皮对土壤CO2通量的降低程度与其生物组成和生物量有关,深色藻结皮和藓结皮土壤CO2通量较裸地分别降低了141%和484%.生物结皮土壤CO2通量的日变化呈降低-升高-降低的趋势,而裸地CO2通量日变化趋势为单峰曲线,藻结皮、藓结皮的碳吸收峰值分别出现在8:00和9:00前后,其CO2通量分别为0.13和-1.02μmolCO2·m-2·s-1;藻结皮24hCO2通量排放总量较裸地增加7.7%,而藓结皮减少了29.6%.生物结皮对土壤CO2通量的影响显著,在评价退耕地土壤碳循环时,应考虑生物结皮的影响. 更多还原
其他摘要	Biological soil crust ( biocrust) is a compact complex layer of soil，which has photosynthetic activity and is one of the factors affecting the CO2 flux of soil-atmosphere interface． In this paper， the soil CO2 flux under the effects of biocrust at different succession stages on the re-vegetated grassland in the hilly region of Loess Plateau was measured by a modified LI-8100 automated CO2 flux system． Under light condition，the soil CO2 flux under effects of cyanobacteria crust and moss crust was significantly decreased by 92% and 305%，respectively，as compared with the flux without the effects of the biocrusts． The decrement of the soil CO2 flux by the biocrusts was related to the biocrusts components and their biomass． Under the effects of dark colored cyanobacteria crust and moss crust，the soil CO2 flux was decreased by 141% and 484%，respectively，as compared with that in bare land． The diurnal curve of soil CO2 flux under effects of biocrusts presented a trend of‘drop-rise-drop’，with the maximum carbon uptake under effects of cyanobacteria crust and moss crust being 0． 13 and －1． 02 μmol CO2·m－2·s－1 and occurred at about 8: 00 and 9: 00 am，respectively， while that in bare land was unimodal． In a day ( 24 h) ，the total CO2 flux under effects of cyanobacteria crust was increased by 7． 7%，while that under effects of moss crust was decreased by 29． 6%，as compared with the total CO2 flux in bare land． This study suggested that in the hilly region of Loess Plateau，biocrust had significant effects on soil CO2 flux，which should be taken into consideration when assessing the carbon budget of the‘Grain for Green’eco-project．
关键词	生物结皮 Biological Soil Crust 土壤co2通量 Soil Co2 Flux 演替 Succession 黄土丘陵区 Hilly Region Of Loess Plateau．
语种	中文
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/5540
专题	水保所知识产出(1956---)
推荐引用方式 GB/T 7714	王爱国,赵允格,许明祥,等. 黄土丘陵区不同演替阶段生物结皮对土壤CO2通量的影响[J]. 应用生态学报,2013,24(03):659-666.
APA	王爱国,赵允格,许明祥,杨丽娜,&明姣.(2013).黄土丘陵区不同演替阶段生物结皮对土壤CO2通量的影响.应用生态学报,24(03),659-666.
MLA	王爱国,et al."黄土丘陵区不同演替阶段生物结皮对土壤CO2通量的影响".应用生态学报 24.03(2013):659-666.

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