Chin J Plan Ecolo ›› 2018, Vol. 42 ›› Issue (3): 327-336.doi: 10.17521/cjpe.2017.0067

• Research Articles • Previous Articles     Next Articles

Effects of enclosure on carbon density of plant-soil system in typical steppe and desert steppe in Nei Mongol, China

YAN Bao-Long,WANG Zhong-Wu*(),QU Zhi-Qiang,WANG Jing,HAN Guo-Dong*()   

  1. College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Huhhot 010019, China
  • Online:2018-03-27 Published:2018-03-20
  • Contact: Zhong-Wu WANG,Guo-Dong HAN E-mail:zhongwuwang1979@163.com;hanguodong@imau.edu.cn
  • Supported by:
    Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA05050402-6);the National Key Research and Development Project of China(2016YFC0500504);the Science and Technology Projects in Inner Mongolia Autonomous Region and West Light Foundation of Chinese Academy of Sciences.

Abstract:

Aims As an immense carbon (C) stock, grassland ecosystem plays a crucial role in global C cycling. The objective of this research was to reveal the effects of enclosure on C density of the plant-soil system by comparing the aboveground biomass (AGB), belowground biomass (BGB) and soil C density in enclosure plots with those in grazing plots in the typical steppe (TS) and desert steppe (DS) in Nei Mongol, China.

Methods At each of the 19 study sites, we set up a 100 m × 100 m plot and 5 quadrats (1 m × 1 m) along the diagonal transect within each plot. At each quadrat, AGB was harvested first and then a soil core (0-100 cm depth, 7 cm inner diameter) was taken for BGB and soil C content measurement. Each soil core was divided into 7 depth increments (0-5 cm, 5-10 cm, 10-20 cm, 20-30 cm, 30-50 cm, 50-70 cm, 70-100 cm).

Important findings (1) Enclosure significantly increased C density of AGB and BGB in TS. In DS, enclosure significantly increased C density of AGB, but had no significant effect on the C density of BGB. (2) Enclosure significantly increased soil C density in TS, but had no significant impact in DS although there was an increasing trend. (3) For all increments along the soil profile, enclosure significantly increased BGB and soil C density compared to grazing plots in TS, but this effect was not found in DS. (4) Enclosure increased C density of the plant-soil system by 2.2 and 1.6 times in TS and DS, respectively. 65% and 89% C was stored in soil in TS and DS, respectively, and BGB C stock accounted for more than 90% of total biomass C in both TS and DS. Enclosure is an effective approach to improve C sequestration in grassland ecosystems.

Key words: enclosure, typical steppe, desert steppe, carbon density, vertical distribution

Fig. 1

Mean precipitation and air temperature of each study site from 2001 to 2012. Solid dots indicate air temperature, and the empty ones indicate precipitation."

Table 1

Study locations and ecosystem characteristics"

草原类型
Steppe type
利用方式
Utilization
pattern
经度
Longitude (° E)
纬度
Latitude (° N)
海拔
Altitude (m)
行政区域
Administrative
division
土壤类型
Soil type
植物群落
Plant community
典型草原
Typical steppe
全年放牧
Year-round
grazing
112.43 43.10 1 081 SY 草原风沙土
Grassland sand soil
冷蒿 Artemisia frigida
113.16 42.12 1 362 SY 淡栗钙土 Light chestnut soil 羊草 Leymus chinensis
113.84 43.83 1 135 SZ 淡栗钙土 Light chestnut soil 西北针茅+冷蒿
Stipa sareptana var. krylovii + Artemisia frigida
114.00 42.54 1 196 XH 栗钙土 Chestnut soil 小叶锦鸡儿+大针茅
Caragana microphylla + Stipa grandis
114.40 42.43 1 258 XH 栗褐土 Cinnamon soil 西北针茅+糙隐子草
Stipa sareptana var. krylovii + Cleistogenes squarrosa
禁牧 Ungrazing 114.43 42.47 1 216 XH 栗钙土 Chestnut soil 冷蒿 Artemisia frigida
115.04 42.26 1 397 ZB 栗钙土 Chestnut soil 西北针茅 Stipa sareptana var. krylovii
115.10 42.60 1 266 ZB 栗褐土 Chestnut soil 西北针茅+冰草
Stipa sareptana var. krylovii + Agropyron cristatum
115.14 42.31 1 334 ZB 栗钙土 Chestnut soil 西北针茅+小叶锦鸡儿
Stipa sareptana var. krylovii + Caragana microphylla
115.27 42.38 1 285 ZB 栗钙土 Chestnut soil 西北针茅+冷蒿
Stipa sareptana var. krylovii + Artemisia frigida
荒漠草原
Desert steppe
全年放牧
Year-round
grazing
111.35 43.39 1 050 SY 淡栗钙土 Light chestnut soil 小针茅+画眉草
Stipa klemenzii + Eragrostis pilosa
112.34 43.27 1 016 SY 棕钙土 Brown soil 小针茅+多根葱
Stipa klemenzii + Allium polyrhizum
112.58 42.95 1 094 SY 淡栗钙土 Light chestnut soil 小针茅+无芒隐子草
Stipa klemenzii + Cleistogenes songorica
113.37 43.41 1 060 SY 淡栗钙土 Light chestnut soil 小针茅 Stipa klemenzii
112.66 44.57 1 193 SZ 棕钙土 Brown soil 西北针茅 Stipa sareptana var. krylovii
113.34 43.95 949 SZ 棕钙土 Brown soil 西北针茅+小叶锦鸡儿
Stipa sareptana var. krylovii + Caragana microphylla
113.63 43.62 1 096 SZ 淡栗钙土 Light chestnut soil 西北针茅 Stipa sareptana var. krylovii
113.83 43.50 1 036 SZ 淡栗钙土 Light chestnut soil 西北针茅+狭叶锦鸡儿
Stipa sareptana var. krylovii + Caragana microphylla
禁牧 Ungrazing 112.74 42.77 1 097 SY 淡栗钙土 Light chestnut soil 西北针茅 Stipa sareptana var. krylovii

Fig. 2

The effects of enclosure and grazing on the carbon density of biomass (mean ± SD). A, Aboveground. B, Belowground. ***, p < 0.000 1."

Fig. 3

The effects of enclosure and grazing on soil carbon density in the typical and desert steppes (mean ± SD). **, p < 0.01."

Fig. 4

The effects of enclosure and grazing on the vertical distribution of belowground biomass carbon density (mean ± SD). A, Typical steppe. B, Desert steppe. ***, p < 0.000 1; **, p < 0.01."

Table 2

The effects of interaction between grazing and soil depth on belowground carbon density"

影响因子 Impact factor 典型草原 Typical steppe 荒漠草原 Desert steppe
地下生物量碳密度
Belowground biomass
carbon density (g·m-2)
土壤碳密度
Soil carbon density
(kg·m-2)
地下生物量碳密度
Belowground biomass
carbon density (g·cm-3)
土壤碳密度
Soil carbon density
(kg·m-2)
F p F p F p F p
放牧利用 Grazing 164.48 <0.000 1 126.39 <0.000 1 33.82 <0.000 1 0.04 0.832 7
土层深度 Soil depth 40.31 <0.000 1 6.88 <0.000 1 0.20 0.655 6 9.86 <0.000 1
放牧利用×土层深度 Grazing × Soil depth 22.41 <0.000 1 1.95 0.086 1 1.05 0.393 4 0.59 0.711 2

Fig. 5

The effects of enclosure and grazing on the vertical distribution of soil carbon density (mean ± SD). A, Typical steppe. B, Desert steppe. ***, p < 0.000 1; **, p < 0.01 *, p < 0.05."

Fig. 6

The effects of enclosure and grazing on litter mass in the typical and desert steppes (mean ± SD). **, p < 0.01."

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