CONTRIBUTION OF THE VEGETATION LAYERS IN THE NITROUS OXIDE EMISSION FROM ALPINE KOBRESIA HUMILIS SERG. MEADOW ECOSYSTEM ON THE TIBETAN PLATEAU

NWIPB OpenIR

	CONTRIBUTION OF THE VEGETATION LAYERS IN THE NITROUS OXIDE EMISSION FROM ALPINE KOBRESIA HUMILIS SERG. MEADOW ECOSYSTEM ON THE TIBETAN PLATEAU
	Du, Yangong 1,2; Cao, Guangmin 2; Deng, Yongcui 1; Sun, Guangchun 2; Cui, Xiaoyong 1
	2010
发表期刊	POLISH JOURNAL OF ECOLOGY
ISSN	1505-2249
卷号	58 期号:1 页码:115-124
文章类型	Article
摘要	Nitrous oxide (N(2)O) was one of the major atmospheric greenhouse gases. Its budget was poorly understood in alpine meadow, a dominant vegetation type on the Tibetan Plateau. To characterize a Kobresia humilis meadow on the plateau, N(2)O emission rates were monitored from June 2003 to June 2006 in the study area located at 3280 in a.s.l. Nine plots with 1 m x 1 in each were divided into three treatments, i.e. intact herbaceous community (HCK), removal of aboveground plant biomass (CBK), and removal of both above and belowground plant biomass (BSK), to estimate contribution of plants, rhizosphere and bulk soil to the total N(2)O emission. N(2)O emission from plant aboveground biomass was calculated by flux difference between HCK and CBK, denoted as F ((HCK-CBK)), from rhizosphere by F ((CBK-BSK)), and from bulk soil was the flux in BSK treatment. Static chambers (height 50 cm, area 0.5 x 0.5 m(2)) were used for gas collection. N(2)O emission rate was significantly correlated with soil temperature at 5 cm depth in both HCK and BSK (P < 0.001). Both treatments demonstrated a seasonal peak rate in growing season and minimum rate in dormancy period. The mean emission rates in the three years were 39.7 +/- 2.9 and 30.6 +/- 2.5 mu g m(-2) h(-1) in HCK and BSK, respectively, with the former significantly higher than the latter (P < 0.05). In CBK, however, the emission rate did not show consistent correlation with soil temperature, especially in growing season. Its three-year mean emission rate was 36.2 +/- 3.3 mu g m(-2) h(-1). In the K.humilis meadow, bulk soil contributed much more than plants and rhizosphere. The mean emission rate was 3.5 +/- 2.9, 5.7 +/- 3.8, and 30.6 +/- 2.5 mu g m(-2) h(-1) (P < 0.001) from plants, rhizosphere and bulk soil, and these accounted for 9, 14 and 77%, separately. Our results implied that N(2)O emission rate decreased little with grazing as indicated by the difference between HCK and CBK in K. humilis meadow (P > 0.01). N(2)O emission from alpine meadow could not be ignored in addressing regional greenhouse gases budget on the Tibetan Plateau, considering the vast area and much higher radiative forcing of N(2)O.; Nitrous oxide (N(2)O) was one of the major atmospheric greenhouse gases. Its budget was poorly understood in alpine meadow, a dominant vegetation type on the Tibetan Plateau. To characterize a Kobresia humilis meadow on the plateau, N(2)O emission rates were monitored from June 2003 to June 2006 in the study area located at 3280 in a.s.l. Nine plots with 1 m x 1 in each were divided into three treatments, i.e. intact herbaceous community (HCK), removal of aboveground plant biomass (CBK), and removal of both above and belowground plant biomass (BSK), to estimate contribution of plants, rhizosphere and bulk soil to the total N(2)O emission. N(2)O emission from plant aboveground biomass was calculated by flux difference between HCK and CBK, denoted as F ((HCK-CBK)), from rhizosphere by F ((CBK-BSK)), and from bulk soil was the flux in BSK treatment. Static chambers (height 50 cm, area 0.5 x 0.5 m(2)) were used for gas collection. N(2)O emission rate was significantly correlated with soil temperature at 5 cm depth in both HCK and BSK (P < 0.001). Both treatments demonstrated a seasonal peak rate in growing season and minimum rate in dormancy period. The mean emission rates in the three years were 39.7 +/- 2.9 and 30.6 +/- 2.5 mu g m(-2) h(-1) in HCK and BSK, respectively, with the former significantly higher than the latter (P < 0.05). In CBK, however, the emission rate did not show consistent correlation with soil temperature, especially in growing season. Its three-year mean emission rate was 36.2 +/- 3.3 mu g m(-2) h(-1). In the K.humilis meadow, bulk soil contributed much more than plants and rhizosphere. The mean emission rate was 3.5 +/- 2.9, 5.7 +/- 3.8, and 30.6 +/- 2.5 mu g m(-2) h(-1) (P < 0.001) from plants, rhizosphere and bulk soil, and these accounted for 9, 14 and 77%, separately. Our results implied that N(2)O emission rate decreased little with grazing as indicated by the difference between HCK and CBK in K. humilis meadow (P > 0.01). N(2)O emission from alpine meadow could not be ignored in addressing regional greenhouse gases budget on the Tibetan Plateau, considering the vast area and much higher radiative forcing of N(2)O.
关键词	Nitrous Oxide Grazing Impact Bulk Soil Sink Alpine Meadow
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]	N2O EMISSIONS ; METHANE EMISSIONS ; SOIL RESPIRATION ; GRAZED PASTURES ; INNER-MONGOLIA ; FLUXES ; PLANTS ; DENITRIFICATION ; STEPPE ; FIELDS
收录类别	SCI
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:000275881400010
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1764
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, Coll Resources & Environm, Grad Univ, Beijing 100049, Peoples R China 2.Chinese Acad Sci, NW Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Du, Yangong,Cao, Guangmin,Deng, Yongcui,et al. CONTRIBUTION OF THE VEGETATION LAYERS IN THE NITROUS OXIDE EMISSION FROM ALPINE KOBRESIA HUMILIS SERG. MEADOW ECOSYSTEM ON THE TIBETAN PLATEAU[J]. POLISH JOURNAL OF ECOLOGY,2010,58(1):115-124.
APA	Du, Yangong,Cao, Guangmin,Deng, Yongcui,Sun, Guangchun,&Cui, Xiaoyong.(2010).CONTRIBUTION OF THE VEGETATION LAYERS IN THE NITROUS OXIDE EMISSION FROM ALPINE KOBRESIA HUMILIS SERG. MEADOW ECOSYSTEM ON THE TIBETAN PLATEAU.POLISH JOURNAL OF ECOLOGY,58(1),115-124.
MLA	Du, Yangong,et al."CONTRIBUTION OF THE VEGETATION LAYERS IN THE NITROUS OXIDE EMISSION FROM ALPINE KOBRESIA HUMILIS SERG. MEADOW ECOSYSTEM ON THE TIBETAN PLATEAU".POLISH JOURNAL OF ECOLOGY 58.1(2010):115-124.