Chin J Plan Ecolo ›› 2018, Vol. 42 ›› Issue (3): 297-306.doi: 10.17521/cjpe.2017.0061

• Research Articles • Previous Articles     Next Articles

Spatial distribution and influencing factors of soil organic carbon among different climate types in Sichuan, China

WANG Li-Hua1,2,XUE Jing-Yue2,3,XIE Yu2,WU Yan2,*()   

  1. 1 Aba Teachers University, Wenchuan, Sichuan 623002, China
    2 Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
    3University of Chinese Academy of Sciences, Beijing 100049, China
  • Online:2017-06-16 Published:2018-03-20
  • Contact: Yan WU E-mail:wuyan@cib.ac.com
  • Supported by:
    Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA05050307)

Abstract:

Aims Spatial distribution and influencing factors of soil organic carbon (SOC) content among different climate types were studied to gain new insights into the estimation and dynamics of SOC.

Methods The study areas are located in the mountain meadow in Guanyuan City, Ya’an City, Liangshan Prefecture of Sichuan Province, China. Plant populations were recorded according to species, number, coverage, meantime, and soil samples (0-10, 10-20, 20-30 cm) were collected and analyzed for SOC content, the carbon content of root, soil pH value, and soil total nitrogen. The diversity indices for plant community diversity (Shannon-? Wiener index) was also calculated to analyze their relationships with SOC content among different climate types.

Important findings Results showed that: (1) SOC in three sites was significantly different and was in the order of Ya’an > Liangshan Prefecture > Guanyuan, and decreased with soil depth. (2) The percentage of SOC content in each vertical layer out of total SOC was lower in the 0-10 cm layer at Ya’an site than at the other two sites, but was higher than the other two sites in the 10-20 cm layer. (3) At Guanyuan site, SOC content in 10-20 cm was significantly positively correlated with plant species richness index and SOC content in 20-30 cm was negatively correlated with plant Shannon-Winner index, while soil pH value and soil total nitrogen were significantly positively correlated with SOC content in each layer. At Ya’an site, SOC content in each layer only had positive correlation with soil pH value, but not with other examined factors. At Liangshan Prefecture site, SOC content in each layer only had positive correlation with soil nitrogen content, but not with other examined factors. (4) Principal component analysis showed that, at Guanyuan, Ya’an and Liangshan Prefecture sites, the total contents of SOC were dominantly affected by climate, followed by vegetation type.

Key words: climate factor, grassland, soil organic carbon, distribution characteristics, correlation analysis

Table 1

Survey of sampling plots"

特征
Characteristics
区域地点 Area and site
广元市 Guangyuan City 雅安市 Ya’an City 凉山州 Liangshan Prefecture
剑阁县、苍溪县、元坝区
Jiange and Cangxi counties;
Yuanba District
汉源县
Hanyuan County
会理县、会东县
Huili and Huidong counties
平均海拔 Mean elevation (m) 754 (616-831) 1β103 (921-1β217) 1β770 (1β651-1β917)
经纬度 Longitude & Latitude 105.47°-107.20° E
31.84°-32.56° N
102.82°-102.89° E
29.29°-29.61° N
101.93°-102.66° E
26.24°-26.79° N
地形地貌 Landform 中山 Middle mountain 中山 Middle mountain 中山 Middle mountain
草地类型 Grassland type 山地疏林草丛草地 Temperate
woodland meadow type rangeland
干热河谷灌木草丛草地
Tropical shrub tussock type rangeland
山地灌木草丛草地 Mountain shrub meadow type rangeland
主要植被组成
Dominant vegetation
白茅杂类草草丛
Imperata cylindrica + forbs
旱茅、黄茅杂类草丛
Schizachyrium delavayi + Heteropogon
contortus +
forbs
黄茅、野古草、紫荆泽兰草丛
Heteropogon contortus + Arundinella anomala + Eupatorium adenophora
草本盖度 Grass coverage 79.76% 78.72% 59.9%
灌木盖度 Bush coverage 1.25% 0.69% 0.92%
土壤类型 Soil type 紫色土 Purple soil 紫色土/黄壤 Purple soil/Yellow soil 黄壤/砖红土 Yellow soil/Laterite
利用强度 Utilize intensity 轻度利用 Mildly used 未利用/轻度利用
Unutilized/ Mildly used
轻度/中度利用
Mildly used/Moderately used
气候类型 Climate type 亚热带季风性湿润气候
Humid subtropical seasonal
-wind climate
亚热带季风性湿润气候(山地干热河谷气候)
Humid subtropical seasonal -wind climate
(The special dry and hot climate)
亚热带西部半湿润气候 Western subtropical semi-humid climate
年降水量
Average annual rainfall (mm)
1β000 742 1β200
年平均气温
Average annual air temperature (℃)
16.1 17.9 15.7
年日照时数
Annual sunshine duration (h)
1β300-1β400 1β475 2β300

Table 2

Soil organic carbon content (0-30 cm) in different areas (mean ± SE, n = 7)"

地区 Area 土壤有机碳含量 Soil organic carbon content (kg·m-2)
0-30 cm 0-10 cm 10-20 cm 20-30 cm
广元 Guangyuan 37.91 ± 3.76a 18.42 ± 1.61Aa 11.46 ± 1.40Ba 8.02 ± 1.21Ba
雅安 Ya’an 62.18 ± 4.40b 25.04 ± 1.66Ab 20.80 ± 1.61ABb 16.34 ± 1.56Bb
凉山 Liangshan 51.06 ± 3.54c 23.44 ± 1.34Ab 15.14 ± 1.31Ba 12.48 ± 1.48Bb

Fig. 1

The percentages of soil organic carbon content in each layer out of total soil organic carbon in the three sites (mean ± SE, n = 7). Different lowercase letters showed significant difference among different soil layers (p < 0.05)."

Table 3

Plant community characteristics and related soil parameters in different areas"

项目 Item 广元 Guangyuan 雅安 Ya’an 凉山 Liangshan
Shannon-Winner指数
Shannon-Winner index
总体 Total 0.71 ± 0.20b 0.90 ± 0.21a 0.61 ± 0.24b
灌木 Bush 0.30 ± 0.05a 0.21 ± 0.08b 0.27 ± 0.07ab
草本 Grass 0.19 ± 0.09b 0.56 ± 0.17a 0.15 ± 0.09b
物种丰富度
Species richness
总体 Total 20.88 ± 2.70b 7.36 ± 0.42a 16.28 ± 1.69b
灌木 Bush 3.84 ± 0.42a 1.72 ± 0.31b 2.16 ± 0.18b
草本 Grass 17.04 ± 2.40a 5.64 ± 0.27 b 14.12 ± 1.70a
根系碳含量 Root carbon content (kg·m-2) 0.28 ± 0.03c 2.08 ± 0.18a 0.70 ± 0.05b
土壤pH值 Soil pH value 6.02 ± 0.18c 7.13 ± 0.11a 6.48 ± 0.19b
土壤全氮含量 Soil total nitrogen content (g·kg-1) 0.10 ± 0.01b 0.11 ± 0.03b 0.15 ± 0.01a
土壤容重 Soil bulk density (g·m-3) 1.49 ± 0.01a 1.37 ± 0.05b 1.34 ± 0.03b

Table 4

The relationship between soil carbon content in each layer and plant community characteristics and soil parameters in different areas"



广元土壤层
Guangyuan soil layer (cm)
雅安土壤层
Ya’an soil layer (cm)
凉山土壤层
Liangshan soil layer (cm)
0-10 10-20 20-30 0-10 10-20 20-30 0-10 10-20 20-30
Shannon-Winner指数
Shannon-Winner index
草本 Grass -0.359 -0.251 -0.489* -0.208 -0.140 -0.184 -0.320 -0.118 0.055
灌木 Bush -0.170 -0.225 -0.437* 0.268 0.191 0.167 -0.272 -0.077 0.059
总体 Total -0.293 -0.259 -0.503* 0.102 0.083 -0.025 -0.301 -0.101 0.062
物种丰富度
Species richness
草本 Grass -0.092 0.666* 0.254 -0.328 -0.369 0.068 0.306 0.161 0.132
灌木 Bush -0.031 0.355 -0.034 0.395 0.301 0.138 -0.239 -0.010 -0.128
总体 Total 0.077 0.645* 0.220 0.084 0.063 0.147 0.210 0.169 0.144
根系碳含量 Root carbon content (kg·m-2) 0.196 0.382 0.380 0.322 0.247 0.290 0.324 0.105 0.105
土壤pH值 Soil pH value 0.527** 0.606** 0.717** 0.517** 0.477* 0.403* 0.020 0.356 0.346
土壤全氮含量 Soil total nitrogen content (g·kg-1) 0.867** 0.860** 0.834** 0.239 0.103 0.027 0.677** 0.681** 0.634**
土壤容重 Soil bulk density (g·m-3) 0.073 0.016 0.063 0.101 0.204 0.209 -0.122 -0.329 -0.378

Table 5

Factor analysis results of soil physical and chemical factors in different areas"

变量 Variable 广元 Guangyuan 雅安 Ya’an 凉山Liangshan
F1 F2 IC F1 F2 IC F1 F2 IC
草本Shannon-Winner指数 Grass Shannon-Winner index 0.963 -0.248 0.939 -0.954 0.183 0.944 0.959 0.118 0.933
灌木Shannon-Winner指数 Bush Shannon-Winner index 0.957 -0.155 0.939 0.949 -0.123 0.915 0.966 0.020 0.934
总体Shannon-Winner指数 Total Shannon-Winner index 0.921 -0.300 0.989 -0.068 0.512 0.267 0.979 0.077 0.965
土壤有机碳含量 Soil organic carbon content (kg·m-2) -0.097 0.981 0.972 0.388 0.504 0.405 -0.333 0.871 0.870
土壤全氮含量 Soil total nitrogen content (g·kg-1) -0.146 0.911 0.679 -0.180 0.825 0.713 0.011 0.908 0.825
根系碳含量 Root carbon content (kg·m-2) -0.268 0.444 0.269 0.761 0.107 0.590 -0.494 0.178 0.275
土壤pH值 Soil pH value -0.385 0.726 0.676 0.680 0.648 0.883 0.428 0.691 0.660
特征值 Characteristic value 2.943 2.691 3.040 1.677 3.350 2.112
解释异质 Heterogeneous value (%) 42.04 38.45 43.42 23.96 47.86 30.18
累积解释异质量 Accumulative heterogeneous value (%) 42.04 80.49 43.42 67.39 47.86 78.04
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