| 塔里木盆地盐生和干旱生境柽柳(Tamarix)凋落物分解特征 |
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| 引用本文： | 杨晶晶,吕瑞恒,梁继业,冯建菊,马国财,康佳鹏.塔里木盆地盐生和干旱生境柽柳(Tamarix)凋落物分解特征[J].中国沙漠,2020,40(1):215-222. |
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| 作者姓名： | 杨晶晶 吕瑞恒 梁继业 冯建菊 马国财 康佳鹏 |
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| 作者单位： | 1. 塔里木大学 生命科学学院, 新疆 阿拉尔 843300;2. 塔里木大学 塔里木盆地生物资源保护利用重点实验室, 新疆 阿拉尔 843300;3. 塔里木大学 植物科学学院, 新疆 阿拉尔 843300 |
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| 基金项目： | 国家自然科学基金项目（31360109）；国家基础资源调查专项（2017FY100200） |
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| 摘 要： | 以塔里木盆地柽柳（Tamarix）凋落物为研究对象，应用凋落袋法，揭示其在盐生（H1）和干旱（H2）生境中分解差异性及主要制约因子。结果表明：（1）经720 d分解，H1、H2生境中柽柳凋落物残留率分别为83.50%、53.73%，两种生境下凋落物残留率差异极显著（P < 0.01）。（2）在H1、H2生境中，柽柳凋落物分解系数分别为0.082、0.320，分解50%所需时间分别为9.40、2.17 a，分解95%所需时间分别为40.62、9.36 a。（3） C元素在H1中富集-释放交替进行，在H2中为单一的富集-释放；N元素在H1中表现出累积-释放交替模式，在H2中表现出相反的变化趋势；P元素在0~360 d分解时间段均呈逐渐释放过程，而在第360~720 d，H1呈逐渐累积过程，H2呈累积-释放模式。木质素呈现逐渐释放模式，纤维素释放模式富集-释放交替进行。经720 d分解，C、N、P、木质素、纤维素残留率在两种生境中均存在极显著差异（P < 0.01）。（4）微生境变化对凋落物分解制约因素并不相同，盐生生境下土壤Na+含量是制约凋落物分解的主要因子，而干旱生境下残留量、土壤Mg2+、凋落物全磷含量起主导作用。
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| 关 键 词： | 凋落物 柽柳(Tamarix) 分解 干旱生境 盐生生境 |
| 收稿时间： | 2019-10-09 |
| 修稿时间： | 2019-11-21 |
Decomposition characteristics of Tamarix litter in different habitats of Tarim Basin |
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| Yang Jingjing,Lv Ruiheng,Liang Jiye,Feng Jianju,Ma Guocai,Kang Jiapeng.Decomposition characteristics of Tamarix litter in different habitats of Tarim Basin[J].Journal of Desert Research,2020,40(1):215-222. |
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| Authors: | Yang Jingjing Lv Ruiheng Liang Jiye Feng Jianju Ma Guocai Kang Jiapeng |
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| Institution: | 1. College of Life Sciences, Alar 843300, Xinjiang, China;2. Key Laboratory of Protection and Utilization of Biological Resource in Tarim Basin, Alar 843300, Xinjiang, China;3. College of Plant Science, Tarim University, Alar 843300, Xinjiang, China |
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| Abstract: | Taking the litter of Tamarix in Tarim Basin as the research objects, litter-bag methods were applied to reveal the decomposition differences and main driving factors in halophytic habitats (H1) and arid habitats (H2). The results showed that:(1) Decomposed in H1 and H2 by 720 d, the litter residual rates of Tamarix were 83.50% and 53.73% respectively. The difference of residue decomposition was extremely significant (P < 0.01) during the decomposing periods of day 0-720. (2) The decomposition coefficient were 0.082 and 0.320, the t0.5 values were 9.398 yrs and 2.166 yrs, and t0.95 values were 40.618 yrs and 9.362 yrs in H1, H2. (3) C elements were enriching-releasing alternately in H1, and a single enriching-releasing model in H2. N elements showed accumulating-releasing alternation pattern in H1, but opposite change trend in H2. P elements were gradually released during day 0-360 decomposition, while in day 360-720 the rule of P elements changed, H1 was gradually accumulating, and H2 was cumulating-releasing. Lignin showed gradually releasing pattern, and cellulose releasing pattern was enriched and released alternately. During the decomposing periods of the 720 d, C, N, P, lignin and cellulose residual rates were significant differences in different habitats (P < 0.01). (4) Comprehensive analysis showed that the changes of microhabitat had different restriction factors on the decomposition of litter. Na+ content of the soil in saline habitat was the critical factor for restricting the decomposition of litter, while residual amount, Mg2+ content of the soil and total phosphorus content of litter in arid habitats had a combining role to litter decomposition. |
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| Keywords: | litter Tamarix decomposition arid habitat saline habitat |
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