Carbon stock and seasonal dynamics of carbon flux in warm-temperature tussock ecosystem in Shandong Province, China

doi:10.17521/cjpe.2015.0329

Abstract

Abstract:

Aims The project was to analyze the carbon stock, seasonal dynamics of carbon flux and the responses of net ecosystem CO₂ exchange (NEE) to various environmental factors of Zoysia japonica warm tussock ecosystem in Shandong Province.

Methods We used field sampling and fixed-point observation-static chamber method (LI-840 infrared analyzer).

Important findings (1) The average carbon density (carbon stock per area) of Z. japonica warm tussock ecosystem in Yaoxiang small watershed was about 2.74 Mg C·hm^-2 and the order of carbon density was as follows: soil carbon (89%) > vegetation carbon (9%) > litter carbon (2%), the total amount of carbon stock of warm tussock in Shandong Province was about 15.88 Tg C. (2) The NEE seasonal dynamics of Z. japonica warm tussock ecosystem was low in summer but high in winter. This ecosystem functioned as carbon source (i.e., CO₂ emissions) during the non-growing seasons (October to March of next year), but acted as carbon sink (net absorption of CO₂) during the growing seasons (April to September). The average carbon sequestration rate during the peak months was -2.58- -4.46 μmol CO₂·m^-2·s^-1. The annual average NEE of small watershed warm tussock was respectively -0.43 and -0.31 μmol CO₂·m^-2·s^-1 in the year of 2012 and 2013, indicating this ecosystem exhibited carbon sink effect. (3) The photosynthetic active radiation (PAR), atmospheric temperature (T_a), vapor pressure deficit (VPD) and the temperature and water content of 10 cm soil depth were the major factors regulating NEE dynamics in Z. japonica warm tussock ecosystem, but drivers of NEE dynamics in different months were different and had the interaction effects between factors. Principal component analysis indicated that the seasonal dynamics of NEE was mainly controlled by the temperature, moisture and light intensity.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201803003

Key words: warm-temperature tussock, Zoysia japonica, carbon pool, carbon sequestration status, carbon flux

LI Yong-Qiang, DONG Zhi, DING Chen-Xi, WANG Ya-Mei, JIA Ji-Wen, ZHANG Jia-Nan, JIAO Shu-Ying. Carbon stock and seasonal dynamics of carbon flux in warm-temperature tussock ecosystem in Shandong Province, China[J]. Chin J Plant Ecol, 2018, 42(3): 277-287.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2015.0329

https://www.plant-ecology.com/EN/Y2018/V42/I3/277

Figures/Tables 8

References 30

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样地区域 Administrative region	地理坐标 Location	坡向 Slope	平均盖度 Average coverage (%)	主要优势种 Dominant species
东平县 Dongping County	116.30° E 36.02° N	半阳坡 Half sunny slope	80	黄荆+百里香 Vitex negundo + Thymus mongolicus
海阳市 Haiyang City	121.18° E 36.86° N	阳坡 Sunny slope	90	结缕草+野古草 Zoysia japonica + Arundinella anomala
莱西市 Laixi City	120.23° E 37.06° N	阳坡 Sunny slope	95	结缕草+野古草 Zoysia japonica + Arundinella anomala
泰山市 Taishan City	117.09° E 36.34° N	半阳坡 Half sunny slope	90	结缕草+白颖薹草+野古草 Zoysia japonica + Carex duriuscula subsp. Rigescens + Arundinella anomala
栖霞市 Qixia City	121.04° E 37.32° N	阳坡 Sunny slope	88	胡枝子+白颖薹草 Lespedeza bicolor + Carex duriuscula subsp. rigescens
沂水县 Yishui County	118.30° E 35.89° N	阳坡 Sunny slope	70	野古草+鸭跖草 Arundinella anomala + Commelina communis
章丘市 Zhangqiu City	117.61° E 36.56° N	半阳坡 Half sunny slope	75	长芒草+黄荆 Stipa bungeana + Vitex negundo

样地区域 Administrative region	地理坐标 Location	坡向 Slope	平均盖度 Average coverage (%)	主要优势种 Dominant species
东平县 Dongping County	116.30° E 36.02° N	半阳坡 Half sunny slope	80	黄荆+百里香 Vitex negundo + Thymus mongolicus
海阳市 Haiyang City	121.18° E 36.86° N	阳坡 Sunny slope	90	结缕草+野古草 Zoysia japonica + Arundinella anomala
莱西市 Laixi City	120.23° E 37.06° N	阳坡 Sunny slope	95	结缕草+野古草 Zoysia japonica + Arundinella anomala
泰山市 Taishan City	117.09° E 36.34° N	半阳坡 Half sunny slope	90	结缕草+白颖薹草+野古草 Zoysia japonica + Carex duriuscula subsp. Rigescens + Arundinella anomala
栖霞市 Qixia City	121.04° E 37.32° N	阳坡 Sunny slope	88	胡枝子+白颖薹草 Lespedeza bicolor + Carex duriuscula subsp. rigescens
沂水县 Yishui County	118.30° E 35.89° N	阳坡 Sunny slope	70	野古草+鸭跖草 Arundinella anomala + Commelina communis
章丘市 Zhangqiu City	117.61° E 36.56° N	半阳坡 Half sunny slope	75	长芒草+黄荆 Stipa bungeana + Vitex negundo

	PAR	T_a	RH	T_s	W	VPD
PAR	1	0.58^*	0.22	0.57^*	-0.34	0.64^*
T_a		1	0.63^*	0.94^**	0.30	0.59^*
RH			1	0.78^**	0.70^*	-0.21
T_s				1	0.44	0.41
W					1	-0.46
VPD						1

	PAR	T_a	RH	T_s	W	VPD
PAR	1	0.58^*	0.22	0.57^*	-0.34	0.64^*
T_a		1	0.63^*	0.94^**	0.30	0.59^*
RH			1	0.78^**	0.70^*	-0.21
T_s				1	0.44	0.41
W					1	-0.46
VPD						1

因素 Factor	第一主成分 The 1st principal component	第二主成分 The 2nd principal component
PAR	0.181	0.827
T_a	0.710	0.651
RH	0.965	-0.050
T_s	0.822	0.515
W	0.774	-0.441
VPD	-0.134	0.940