Soil respiration dynamics and impact factor analysis of a shrubland-grassland ecotone in the Eastern Qilian Mountains

doi:10.11686/cyxb2015019

Abstract

Abstract: This research explored the factors influencing soil respiration dynamics of an alpine Shrubland-Grassland ecotone. The soil respiration dynamics were measured using a LI-8100A automated soil CO₂ flux system, and relationship between soil respiration and soil factors was analysed for an eastern Qilian Mountain typical Shrubland-Grassland ecotone. The mean soil respiration rate was 2.3-7.2 μmol CO₂/(m²·s). The rankings of soil respiration rate at different sampling points were: Polygonum viviparum meadow center (S₁)>Polygonum viviparum meadow-Potentilla fruticosa shrub ecotone (MSC₁)>Potentilla fruticosa shrub center (S₂)>Potentilla fruticosa-Rhododendron shrub ecotone (MSC₂)>Rhododendron shrub center (S₃). The diurnal variation of soil respiration of S₁ and MSC₁ had a unimodal pattern, with the peak at 14:00. For S₂, MSC₂ and S₃ respiration rates were only 0.3-1.1 μmol CO₂/(m²·s) and the peak was not obvious. Soil physical properties showed a significant vertical gradation within ecotones. Soil respiration rate was significantly and positively correlated with soil temperature and total phosphorus (P<0.01), significantly negatively correlated with soil moisture (P<0.01), and significantly positively correlated with soil organic carbon in the 0-20 cm soil layer (P<0.05). Analysis of the relationship between soil respiration and soil temperature, soil moisture, total phosphorus, and organic carbon showed that soil temperature, soil moisture and total phosphorus were the main limiting factors for soil respiration rate. The highest fitted coefficient was soil temperature, which explained 79.9% of the spatial variability in soil respiration.

WEI Wei, ZHOU Juan-Juan, CAO Wen-Xia, XU Chang-Lin. Soil respiration dynamics and impact factor analysis of a shrubland-grassland ecotone in the Eastern Qilian Mountains[J]. Acta Prataculturae Sinica, 2015, 24(12): 1-9.

References

[1] Li X Z, Shao M A, Wei X R, et al . Effects of water and density on soil respiration in vegetated grassland in wind-water erosion crisscross region. Journal of Soil and Water Conservation, 2011, 25(4): 207-211.
[2] Raich J W, Potter C S, Hagawai D B. Interannual variability in global soil respiration,1980-1994. Global Change Biology, 2002, 8(8): 800-812.
[3] Bond-Lamberty B, Thomson A. Temperature-associated increases in the global soil respiration record. Nature, 2010, 464: 579-582.
[4] Chen S T, Huang Y, Zou J W, et al . Interannual variability in soil respiration from terrestrial ecosystems in China and its response to climate change. Science in China (Ser. D, Earth Sciences), 2012, 42(8): 1273-1281.
[5] Zhou H H, Li W H, Yang Y H, et al . Soil respiration variant and its effecting factors at different land use in arid land. Scientia Geographica Sinica, 2011, 31(2): 190-197.
[6] Huang X, Chen Y N, Li W H, et al . Analysis of carbon flux of soil and its related factors from Tamarix spp. community in the middle and lower reaches of Tarim River. Environmental Science, 2006, 27(10): 1934-1941.
[7] Li X D, Shen X K, Zhang C P, et al . Factors influencing soil respiration in a pea field in the Loess plateau. Acta Prataculturae Sinica, 2014, 23(5): 24-30.
[8] Yang Y S, Dong B, Xie J S, et al . Soil respiration of forest ecosystems and its respondence to global change. Acta Ecologica Sinica, 2004, 24(3): 583-591.
[9] Yang Y, Han G D, Li Y H, et al . Response of soil respiration to grazing intensity, water contents, and temperature of soil in different grasslands of Inner Mongolia. Acta Prataculturae Sinica, 2012, 21(6): 8-14.
[10] Li H J, Yan J X, Li J J, et al . Soil CO 2 efflux from two shrub stands in a mountain area of the eastern Loess Plateau. Acta Scientiae Circumstantiae, 2010, 30(9): 1895-1904.
[11] Lin X W, Zhang Z H, Wang S P, et al . Response of ecosystem respiration to warming and grazing during the growing seasons in the alpine meadow on the Tibetan Plateau. Agricultural and Forest Meteorology, 2011, 151(7): 792-802.
[12] Maestre F T, Cortina J. Small scale spatial variation in soil CO 2 efflux in a Mediterranean semiarid steppe. Applied Soil Ecology, 2003, 23: 199-209.
[13] Li Q. Landscape Change on Patch Level in the Eastern Qilian Mountains[D]. Lanzhou: Gansu Agricultural University, 2009.
[14] Chen G C, Peng M, Huang R F, et al . Vegetation characteristics and its distribution of Qilian Mountain in region. Acta Botanica Sinica, 1994, 36(1): 63-72.
[15] Yu B H, Lv C H. Assessment of ecological vulnerability on the Tibetan Plateau. Geographical Research, 2011, 30(12): 2289-2295.
[16] Chen J, Cao J J, Wei Y L, et al . Effect of grazing exclusion on soil respiration during the dormant season in alpine meadow grassland ecosystems on the northern shore of Qinghai Lake, China. Acta Prataculturae Sinica, 2014, 23(6): 78-86.
[17] Wen J, Zhou H K, Yao B Q, et al . Characteristics of soil respiration in different degraded alpine grassland in the source region of Three-River. Chinese Journal of Plant Ecology, 2014, 38(2): 209-218.
[18] Bao S D. Agrochemical Soil Analysis[M]. Beijing: China Agriculture Press, 2005: 30-76.
[19] Yang C D, Long R J, Chen X R, et al . Characteristics of carbon, nitrogen and phosphorus density in top soil under different alpine grasslands on the Eastern Qilian Mountains. Chinese Journal of Grassland, 2008, 30(1): 1-5.
[20] Yang J, Huang J H, Zhan X M, et al . The diurnal dynamic patterns of soil respiration for different plant communities in the agro-pastoral ecotone with reference to different measuring methods. Acta Phytoecologica Sinica, 2004, 28(3): 318-325.
[21] Wang N, Huang Y X, Ye G F, et al . Responses of soil respiration rate in Chinese fir plantation to the changes of heat and moisture condition. Chinese Journal of Ecology, 2012, 31(10): 2461-2465.
[22] Wang C, Huang Q B, Yang Z J, et al . Analysis of vertical profiles of soil CO 2 efflux in Chinese fir plantation. Acta Ecologica Sinica, 2011, 31(19): 5711-5719.
[23] Raich J W, Tufekcioglu A. Vegetation and soil respiration: correlations and controls. Biogeochemistry, 2000, 48(1): 71-90.
[24] Bahn M, Reichstein M, Davidson E A, et al . Soil respiration at mean annual temperature predicts annual total across vegetation types and biomes. Biogeosciences, 2010, 7(7): 2147-2157.
[25] Chang Z Q, Feng Q, Si J H, et al . Analysis of the spatial and temporal changes in soil CO 2 efflux and its related factors from alpine meadow in Qilian Mountains. Environmental Science, 2007, 28(10): 2389-2395.
[26] Olthof I, Pouliot D. Treeline vegetation composition and change in Canada’s western Subarctic from AVHRR and canopy reflectance modeling. Remote Sensing of Environment, 2010, 114: 805-815.
[27] Zhu F M, An S Q, Guan B H, et al . A review of ecotone concepts attributes theories and research advances. Acta Ecologica Sinica, 2007, 27(7): 3032-3042.
[28] Tripathi S, Kumari S, Chakraborty A, et al . Microbial biomass and its activities in salt-affected coastal soils. Biology and Fertility of Soils, 2006, 42: 273-277.
[29] Sikora L J, McCoy L. Attempts to determine available carbon in soils. Biology and Fertility of Soils, 1990, 9: 19-24.
[30] Zhao J X, Wang S J, Chen Q B, et al . Soil respiration and its affecting factors in young and mature forests of Pinus yunnanensis in middle Yunnan plateau, China. Journal of Nanjing Forestry University (Natural Sciences Edition), 2014, 38(3): 71-76.
[31] Zhang W, Liu S J, Ye Y Y, et al . Spatial variability of soil nutrients and influencing factors in typical karst virgin forest. Transactions of the Chinese Society of Agricultural Engineering, 2013, 29(1): 93-101.
[32] Wang B, Li J, Jiang W W, et al . Impacts of the rangeland degradation on CO 2 flux and the underlying mechanisms in the Three-River Source Region on the Qinghai-Tibetan plateau. China Environmental Science, 2012, 32(10): 1764-1771.
[33] Qi W W, Niu H S, Wang S P, et al . Simulation of effects of warming on carbon budget in alpine meadow ecosystem on the Tibetan plateau. Acta Ecologica Sinica, 2012, 32(6): 1713-1722.
[34] Zhang H X, Wang X K, Feng Z W, et al . The great rainfall effect on soil respiration of wheat field in semi-arid region of the Loess plateau. Acta Ecologica Sinica, 2008, 28(12): 6189-6196.
[35] Li J J, Cao J, Yan J X, et al . Correlation between soil respiration and environmental factors under different reclamation systems in a mining area. Acta Scientiae Circumstantiae, 2014, 34(8): 2102-2110.
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[4] 陈书涛, 黄耀, 邹建文, 等. 中国陆地生态系统土壤呼吸的年际间变异及其对气候变化的响应. 中国科学(D辑), 2012, 42(8): 1273-1281.
[5] 周洪华, 李卫红, 杨余辉, 等. 干旱区不同土地利用方式下土壤呼吸日变化差异及影响因素. 地理科学, 2011, 31(2): 190-197.
[6] 黄湘, 陈亚宁, 李卫红, 等. 塔里木河中下游柽柳群落土壤碳通量及其影响因子分析. 环境科学, 2006, 27(10): 1934-1941.
[7] 李旭东, 沈晓坤, 张春平, 等. 黄土高原农田土壤呼吸特征及其影响因素. 草业学报, 2014, 23(5): 24-30.
[8] 杨玉盛, 董彬, 谢锦升, 等. 森林土壤呼吸及其对全球变化的响应. 生态学报, 2004, 24(3): 583-591.
[9] 杨阳, 韩国栋, 李元恒, 等. 内蒙古不同草原类型土壤呼吸对放牧强度及水热因子的响应. 草业学报, 2012, 21(6): 8-14.
[10] 李洪建, 严俊霞, 李君剑, 等. 黄土高原东部山区两种灌木群落的土壤碳通量研究. 环境科学学报, 2010, 30(9): 1895-1904.
[13] 李泉. 祁连山东段景观变化研究[D]. 兰州: 甘肃农业大学, 2009.
[14] 陈桂琛, 彭敏, 黄荣福, 等. 祁连山地区植被特征及其分布规律. 植物学报, 1994, 36(1): 1-9.
[15] 于伯华, 吕昌河. 青藏高原高寒区生态脆弱性评价. 地理研究, 2011, 30(12): 2289-2295.
[16] 陈骥, 曹军骥, 魏永林, 等. 青海湖北岸高寒草甸草原非生长季土壤呼吸对温度和湿度的响应. 草业学报, 2014, 23(6): 78-86.
[17] 温军, 周华坤, 姚步青, 等. 三江源区不同退化程度高寒草原土壤呼吸特征. 植物生态学报, 2014, 38(2): 209-218.
[18] 鲍士旦. 土壤农化分析[M]. 北京: 中国农业出版社, 2000: 30-76.
[19] 杨成德, 龙瑞军, 陈秀蓉, 等. 东祁连山不同高寒草地类型土壤表层碳、氮、磷密度特征. 中国草地学报, 2008, 30(1): 1-5.
[20] 杨晶, 黄建辉, 詹学明, 等. 农牧交错区不同植物群落土壤呼吸的日动态观测与测定方法比较. 植物生态学报, 2004, 28(3): 318-325.
[21] 汪娜, 黄义雄, 叶功富, 等. 杉木人工林土壤呼吸速率对水热条件变化的响应. 生态学杂志, 2012, 31(10): 2461-2465.
[22] 王超, 黄群斌, 杨智杰, 等. 杉木人工林不同深度土壤 CO 2 通量. 生态学报, 2011, 31(19) : 5711-5719.
[25] 常宗强, 冯起, 司建华, 等. 祁连山高山草甸土壤CO 2 通量的时空变化及其影响分析. 环境科学, 2007, 28(10): 2389-2395.
[27] 朱芬萌, 安树青, 关保华, 等. 生态交错带及其研究进展. 生态学报, 2007, 27(7): 3032-3042.
[30] 赵吉霞, 王邵军, 陈奇伯, 等. 滇中高原云南松幼林和成熟林土壤呼吸及主要影响因子分析. 南京林业大学学报(自然科学版), 2014, 38(3): 71-76.
[31] 张伟, 刘淑娟, 叶莹莹, 等. 典型喀斯特林地土壤养分空间变异的影响因素. 农业工程学报, 2013, 29(1): 93-101.
[32] 王斌, 李洁, 姜微微, 等. 草地退化对三江源区高寒草甸生态系统CO 2 通量的影响及其原因. 中国环境科学, 2012, 32(10): 1764-1771.
[33] 亓伟伟, 牛海山, 汪诗平, 等. 增温对青藏高原高寒草甸生态系统固碳通量影响的模拟研究. 生态学报, 2012, 32(6): 1713-1722.
[34] 张红星, 王效科, 冯宗炜, 等. 黄土高原小麦田土壤呼吸对强降雨的响应. 生态学报, 2008, 28(12): 6189-6196.
[35] 李君剑, 曹杰, 严俊霞, 等. 矿区不同复垦措施下土壤呼吸与环境因子关系的研究. 环境科学学报, 2014, 34(8): 2102-2110.