Effects of water input on litter decomposition and nitrogen dynamics of desert vegetation in the Liangucheng National Nature Reserve， Gansu， China

doi:10.7522/j.issn.1000-694X.2020.00105

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (2): 145-152.DOI: 10.7522/j.issn.1000-694X.2020.00105

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Effects of water input on litter decomposition and nitrogen dynamics of desert vegetation in the Liangucheng National Nature Reserve， Gansu， China

Chengbing Gao¹(), Zongqiang Chang²()

^1.Managing Bureau of Liangucheng National Reserve，Minqin 733300，Gansu，China
^2.Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China

Received:2020-07-23 Revised:2020-09-23 Online:2021-03-20 Published:2021-03-26
Contact: Zongqiang Chang

Abstract

Abstract:

Based on the rainfall interception experiment of four different rainfall gradients （control and three levels：interception of 30%， 50% and 80%） in Liangucheng National Nature Reserve， the litter decomposition and nutrient release of inorganic soil nitrogen and in-situ net nitrogen mineralization of typical desert vegetation were observed and analyzed in two consecutive years. The main results are：（1） With the decrease of water input， the decomposition rate of litter also decreased， and there was a positive correlation between litter decomposition rate and annual precipitation. On the contrary， net nitrogen mineralization has nothing to do with precipitation. （2） Soil NO $3 -$ significantly decreased with increasing precipitation input， whereas soil NH $4 +$ concentration did not differ among precipitation interception treatments. （3） In Liangucheng National Nature Reserve， the decomposition rate of desert vegetation litter is closely related to the actual rainfall， and under different control conditions， the content of carbon and nitrogen in the litter changes with time.

Key words: Liangucheng National Nature Reserve, desert ecosystem, decomposition, nitrogen release, rainfall interception

CLC Number:

S714.2

Chengbing Gao, Zongqiang Chang. Effects of water input on litter decomposition and nitrogen dynamics of desert vegetation in the Liangucheng National Nature Reserve， Gansu， China[J]. Journal of Desert Research, 2021, 41(2): 145-152.

Figures/Tables 7

References 45

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处理	不同采集时间（年-月）土壤含水量/%
处理	2018-05	2018-08	2018-11	2019-02	2019-05	2019-08	2019-11	2020-01
对照（无截留）	2.34±0.04	3.70±0.03	2.81±0.06	1.58±0.03	2.56±0.11	3.18±0.05	2.51±0.02	1.38±0.04
截留降水30%	1.89±0.02	2.59±0.05	1.97±0.04	1.12±0.05	1.83±0.03	2.32±0.04	1.78±0.03	1.02±0.03
截留降水50%	1.49±0.03	1.75±0.03	1.54±0.04	0.97±0.03	1.33±0.04	1.62±0.04	1.31±0.04	0.79±0.04
截留降水80%	0.76±0.03	0.89±0.04	0.84±0.03	0.48±0.02	0.86±0.03	0.96±0.02	0.73±0.02	0.55±0.03

处理	不同采集时间（年-月）土壤含水量/%
处理	2018-05	2018-08	2018-11	2019-02	2019-05	2019-08	2019-11	2020-01
对照（无截留）	2.34±0.04	3.70±0.03	2.81±0.06	1.58±0.03	2.56±0.11	3.18±0.05	2.51±0.02	1.38±0.04
截留降水30%	1.89±0.02	2.59±0.05	1.97±0.04	1.12±0.05	1.83±0.03	2.32±0.04	1.78±0.03	1.02±0.03
截留降水50%	1.49±0.03	1.75±0.03	1.54±0.04	0.97±0.03	1.33±0.04	1.62±0.04	1.31±0.04	0.79±0.04
截留降水80%	0.76±0.03	0.89±0.04	0.84±0.03	0.48±0.02	0.86±0.03	0.96±0.02	0.73±0.02	0.55±0.03

年份	季节	净氮矿化量/（mg·m^-2）
年份	季节	对照	截留降水30%	截留降水50%	截留降水80%
2018	冬季	0.135±0.032	0.016±0.053	0.123±0.012	0.216±0.034
	春季	-0.253±0.086	0.116±0.312	-0.187±0.114	0.002±0.113
	夏季	0.794±0.043	1.043±0.154	0.987±0.252	1.076±0.074
	秋季	0.136±0.085	0.027±0.084	0.128±0.034	0.226±0.075
2019	冬季	-0.093±0.013	-0.072±0.015	-0.156±0.085	-0.146±0.046
	春季	0.448±0.032	0.063±0.113	0.756±0.033	1.132±0.073
	夏季	1.347±0.153	1.487±0.032	2.639±0.112	1.986±0.156
	秋季	-0.359±0.073	-0.254±0.145	-0.524±0.064	-0.352±0.113

年份	季节	净氮矿化量/（mg·m^-2）
年份	季节	对照	截留降水30%	截留降水50%	截留降水80%
2018	冬季	0.135±0.032	0.016±0.053	0.123±0.012	0.216±0.034
	春季	-0.253±0.086	0.116±0.312	-0.187±0.114	0.002±0.113
	夏季	0.794±0.043	1.043±0.154	0.987±0.252	1.076±0.074
	秋季	0.136±0.085	0.027±0.084	0.128±0.034	0.226±0.075
2019	冬季	-0.093±0.013	-0.072±0.015	-0.156±0.085	-0.146±0.046
	春季	0.448±0.032	0.063±0.113	0.756±0.033	1.132±0.073
	夏季	1.347±0.153	1.487±0.032	2.639±0.112	1.986±0.156
	秋季	-0.359±0.073	-0.254±0.145	-0.524±0.064	-0.352±0.113

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Effects of water input on litter decomposition and nitrogen dynamics of desert vegetation in the Liangucheng National Nature Reserve， Gansu， China

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