干旱区琵琶柴群落细根周转对土壤有机碳循环的贡献

doi:10.3724/SP.J.1258.2011.01182

摘要/Abstract

摘要：

尽管干旱区生态系统的脆弱性受到了广泛的关注, 但目前关于干旱区植物细根有机碳与土壤碳循环关系的研究还比较少见。在2010年整个生长季节内, 采用土钻法和内生长法, 对新疆干旱区的琵琶柴(Reaumuria soongorica)群落土壤特性、细根的生物量月动态、生产量和周转进行了研究。结果表明: 琵琶柴群落表层土壤含水量最低, 土壤含水量表现出从浅层到深层逐渐增加的趋势; 而表层土壤的有机碳含量最高, 随着土壤深度的加深, 有机碳含量逐渐降低。细根生物量的月平均值为54.51 g·m^-2, 群落细根生产量在82.76-136.21 g·m^-2·a^-1之间, 琵琶柴群落的细根周转率为2.08 times·a^-1, 通过细根死亡进入土壤中的有机碳为17 g·m^-2·a^-1。这些结果表明: 由于灌丛细根高的周转速率, 细根是干旱区土壤有机碳输入的重要部分。

关键词: 干旱区生态系统, 细根, 琵琶柴群落, 土壤有机碳, 土壤水分

Abstract:

Aims Our objective was to investigate the soil organic carbon stock, fine root turnover and its contribution to soil carbon cycling of Reaumuria soongorica community in an arid ecosystem in Xinjiang Uygur Autonomous Region, China.
Methods We selected a R. soongorica community, a typical local community, in natural areas around the Ecological Station of Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences. We investigated the distribution and dynamics of soil organic carbon, monthly fine root dynamics, production and turnover rate throughout the 2010 growing season by means of sequential coring and ingrowth core. We calculated the soil organic carbon pool, fine roots carbon stocks and contribution of fine roots.
Important findings Soil water content increased with depth, but soil organic carbon decreased. The mean fine root mass in the community was 54.51 g·m^-2, and annual fine root production was estimated to be 82.76-136.21 g·m^-2·a^-1. Fine root turnover rate in the community was 2.08 times·a^-1, and annual inputs from fine root mortality to belowground soil organic carbon was 17 g·m^-2·a^-1. These results demonstrate that due to the high turnover rate of shrub fine root in the arid region, shrub fine root carbon is a crucial portion of soil organic carbon inputs.

Key words: arid ecosystem, fine root, Reaumuria soongorica community, soil organic carbon, soil water

裴智琴, 周勇, 郑元润, 肖春旺. 干旱区琵琶柴群落细根周转对土壤有机碳循环的贡献. 植物生态学报, 2011, 35(11): 1182-1191. DOI: 10.3724/SP.J.1258.2011.01182

PEI Zhi-Qin, ZHOU Yong, ZHENG Yuan-Run, XIAO Chun-Wang. Contribution of fine root turnover to the soil organic carbon cycling in a Reaumuria soon- goricacommunity in an arid ecosystem of Xinjiang Uygur Autonomous Region, China. Chinese Journal of Plant Ecology, 2011, 35(11): 1182-1191. DOI: 10.3724/SP.J.1258.2011.01182

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2011.01182

https://www.plant-ecology.com/CN/Y2011/V35/I11/1182

图/表 9

表1 细根月生产量和死亡量公式

Table 1 Formula of monthly fine root production and mortality

	活细根 Live fine root
	增加 Increase	减少 Decrease
死细根 Dead fine root		ΔB^dead > ΔB^live	ΔB^live > Δ B^dead
增加 Increase	P = ΔB^live + ΔB^dead M = ΔB^dead	P = ΔB^live + ΔB^dead M = ΔB^dead	P= 0 M =-ΔB^live
减少 Decrease	P= ΔB^live M = 0	P= 0 M =-ΔB^live

图1 琵琶柴群落细根生物量的月变化(平均值±标准误差)。左图: 活根; 右图: 死根。

Fig. 1 Monthly variations of fine root biomass of Reaumuria soongorica community (mean ± SE). Left figure: live root; Right figure: dead root.

图2 琵琶柴群落土壤含水量的月变化(平均值±标准误差) (6月与9月取样时间为降雨后, 造成表层土壤含水量偏高)。

Fig. 2 Monthly variations of soil water content (SWC) of Reaumuria soongorica community (mean ± SE) (Higher SWC in soil surface layer was observed in June and September due to sampling after the rains.

表2 取样时间(ST)和土层(SL)对土壤含水量、土壤有机碳、活细根生物量、死细根生物量和生产量的方差分析的F值

Table 2 F values of the effects of sampling time (ST) and soil layer (SL) on soil water content (SWC), soil organic carbon (SOC), fine root biomass, necromass and production by ANOVA

因素 Factor	土壤含水量 SWC	土壤有机碳 SOC	活细根生物量 Live fine root biomass	死细根生物量 Fine root necromass	细根生产量 Fine root production
ST	196.16***	2.64*	9.89***	6.21***	2.62*
SL	179.07***	47.99***	2.44^NS	2.90^NS	0.45^NS
ST × SL	33.46***	0.77^NS	1.41^NS	3.58**	1.30^NS

图3 琵琶柴群落细根生产量的月变化(细根月生产量月动态采用了平衡转化法计算, 平均值±标准误差)。

Fig. 3 Monthly variations of fine root production of Reaumuria soongorica community (calculated by using the method of Decision matrix, mean ± SE).

图4 琵琶柴群落细根的年生产量(平均值±标准误差)。

Fig. 4 Annual fine root production of Reaumuria soongorica community (mean ± SE).

图5 琵琶柴群落的细根死亡量(平均值±标准误差)。

Fig. 5 Fine root mortality of Reaumuria soongorica community (mean ± SE).

图6 琵琶柴群落的细根周转率和死亡率(平均值±标准误差)。

Fig. 6 Fine root turnover rate and mortality rate of Reaumuria soongorica community (mean ± SE).

图7 琵琶柴群落的土壤有机碳(平均值±标准误差)。

Fig. 7 Soil organic carbon (SOC) content of Reaumuria soongorica community (mean ± SE).

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