Storage of carbon, nitrogen and phosphorus in temperate shrubland ecosystems across Northern China

doi:10.17521/cjpe.2016.0201

Abstract

Abstract:

Aims Studying storage of carbon (C), nitrogen (N) and phosphorus (P) in ecosystems is of significance in understanding carbon and nutrient cycling. Previous researches in ecosystem C, N and P storage have biased towards forests and grasslands. Shrubland ecosystems encompass a wide gradient in precipitation and soil conditions, providing a unique opportunity to explore the patterns of ecosystem C, N and P storage in relation to climate and soil properties.
Methods We estimated densities and storage of organic C, N and P of shrubland ecosystems in Northern China based on data from 433 shrubland sites.
Important findings The main results are summarized as follows: the average organic C, N and P densities in temperate shrubland ecosystems across Northern China were 69.8 Mg·hm^-2, 7.3 Mg·hm^-2 and 4.2 Mg·hm^-2, respectively. The average plant C, N and P densities were 5.1 Mg·hm^-2, 11.5 × 10^-2 Mg·hm^-2 and 8.6 × 10^-3 Mg·hm^-2, respectively, and were significantly correlated with precipitation and soil nutrient concentrations. The average litter C, N and P densities were 1.4 Mg·hm^-2, 3.8 ×10^-2 Mg·hm^-2, 2.5 ×10^-3 Mg·hm^-2and were significantly correlated with temperature and precipitation. The average soil organic C, N and P densities in the top 1 m were 64.0 Mg·hm^-2, 7.1 Mg·hm^-2 and 4.2 Mg·hm^-2, respectively and the former two were significantly correlated with temperature and precipitation. The total organic C, N and P storage of shrublands in Northern China were 1.7 Pg, 164.9 Tg and 124.8 Tg, respectively. The plant C, N and P storage were 128.4 Tg, 3.1 Tg and 0.2 Tg, respectively. The litter C, N and P storage were 8.4 Tg, 0.45 Tg, 0.027 Tg, respectively. Soil is the largest C, N and P pool in the studied area. The soil organic C, N and P storage in the top 1 meter were 1.6 Pg, 161.3 Tg and 124.6 Tg, respectively.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201701003

Key words: carbon, nitrogen, phosphorus, storage, density, shrublands, Northern China

Yan-Pei GUO, Xian YANG, Anwar MOHHAMOT, Hong-Yan LIU, Wen-Hong MA, Shun-Li YU, Zhi-Yao TANG. Storage of carbon, nitrogen and phosphorus in temperate shrubland ecosystems across Northern China[J]. Chin J Plant Ecol, 2017, 41(1): 14-21.

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References 29

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	落叶阔叶灌丛 Deciduous broadleaf shrublands	稀疏灌丛 Sparse shrublands	总计 Total
样地数 Number of sites	329	104	433
碳密度 C density (Mg·hm^-2)	86.1 ± 3.7	22.1 ± 2.0	69.8 ± 3.0
生物量 Biomass (Mg·hm^-2)	6.1 ± 0.3	1.9 ± 0.3	5.1 ± 0.2
凋落物 Litter (Mg·hm^-2)	1.5 ± 0.2	0.7 ± 0.1	1.4 ± 0.1
土壤有机碳 Soil organic C (Mg·hm^-2)	78.5 ± 3.6	19.5 ± 1.9	64.0 ± 3.0
氮密度 N density (Mg·hm^-2)	8.1 ± 0.3	2.6 ± 0.3	7.3 ± 0.3
生物量 Biomass (10^-2 Mg·hm^-2)	12.9 ± 0.6	6.4 ± 0.7	11.5 ± 0.5
凋落物 Litter (10^-2 Mg·hm^-2)	4.0 ± 0.4	1.8 ± 0.2	3.8 ± 0.3
土壤 Soil (Mg·hm^-2)	7.9 ± 0.4	2.5 ± 0.3	7.1 ± 0.3
磷密度 P density (Mg·hm^-2)	4.3 ± 0.2	3.7 ± 0.3	4.2 ± 0.2
生物量 Biomass (10^-3 Mg·hm^-2)	9.9 ± 0.5	3.6 ± 0.3	8.6 ± 0.4
凋落物 Litter (10^-3 Mg·hm^-2)	2.7 ± 0.2	0.9 ± 0.2	2.5 ± 0.2
土壤 Soil (Mg·hm^-2)	4.3 ± 0.2	3.7 ± 0.3	4.2 ± 0.2

	落叶阔叶灌丛 Deciduous broadleaf shrublands	稀疏灌丛 Sparse shrublands	总计 Total
样地数 Number of sites	329	104	433
碳密度 C density (Mg·hm^-2)	86.1 ± 3.7	22.1 ± 2.0	69.8 ± 3.0
生物量 Biomass (Mg·hm^-2)	6.1 ± 0.3	1.9 ± 0.3	5.1 ± 0.2
凋落物 Litter (Mg·hm^-2)	1.5 ± 0.2	0.7 ± 0.1	1.4 ± 0.1
土壤有机碳 Soil organic C (Mg·hm^-2)	78.5 ± 3.6	19.5 ± 1.9	64.0 ± 3.0
氮密度 N density (Mg·hm^-2)	8.1 ± 0.3	2.6 ± 0.3	7.3 ± 0.3
生物量 Biomass (10^-2 Mg·hm^-2)	12.9 ± 0.6	6.4 ± 0.7	11.5 ± 0.5
凋落物 Litter (10^-2 Mg·hm^-2)	4.0 ± 0.4	1.8 ± 0.2	3.8 ± 0.3
土壤 Soil (Mg·hm^-2)	7.9 ± 0.4	2.5 ± 0.3	7.1 ± 0.3
磷密度 P density (Mg·hm^-2)	4.3 ± 0.2	3.7 ± 0.3	4.2 ± 0.2
生物量 Biomass (10^-3 Mg·hm^-2)	9.9 ± 0.5	3.6 ± 0.3	8.6 ± 0.4
凋落物 Litter (10^-3 Mg·hm^-2)	2.7 ± 0.2	0.9 ± 0.2	2.5 ± 0.2
土壤 Soil (Mg·hm^-2)	4.3 ± 0.2	3.7 ± 0.3	4.2 ± 0.2

灌丛植被型 Shrubland types	落叶阔叶灌丛 Deciduous broadleaf shrublands	稀疏灌丛 Sparse shrublands	总计 Total
面积 Area (10⁴ hm²)	1 828.6	1 050.4	2 879.0
碳储量 C storage (Tg)	1 537.6	183.5	1 721.1
生物量 Biomass	118.6	9.8	128.4
凋落物 Litter	8.2	0.2	8.4
土壤有机碳 Soil organic C	1 410.8	173.5	1 584.3
氮储量 N storage (Tg)	137.1	27.8	164.9
生物量 Biomass	2.8	0.3	3.1
凋落物 Litter	4.5	0.0	4.5
土壤 Soil	133.8	27.5	161.3
磷储量 P storage (Tg)	80.7	44.1	124.8
生物量 Biomass	0.2	0.0	0.2
凋落物 Litter	2.7	0.0	2.7
土壤 Soil	80.5	44.1	124.6

灌丛植被型 Shrubland types	落叶阔叶灌丛 Deciduous broadleaf shrublands	稀疏灌丛 Sparse shrublands	总计 Total
面积 Area (10⁴ hm²)	1 828.6	1 050.4	2 879.0
碳储量 C storage (Tg)	1 537.6	183.5	1 721.1
生物量 Biomass	118.6	9.8	128.4
凋落物 Litter	8.2	0.2	8.4
土壤有机碳 Soil organic C	1 410.8	173.5	1 584.3
氮储量 N storage (Tg)	137.1	27.8	164.9
生物量 Biomass	2.8	0.3	3.1
凋落物 Litter	4.5	0.0	4.5
土壤 Soil	133.8	27.5	161.3
磷储量 P storage (Tg)	80.7	44.1	124.8
生物量 Biomass	0.2	0.0	0.2
凋落物 Litter	2.7	0.0	2.7
土壤 Soil	80.5	44.1	124.6