烟台海岸带地区狗尾草内稳性缓解P限制

钟小瑛; 任奕炜; 衣华鹏; 祝贺; 高猛

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (10) : 5498-5507.

环境生态

烟台海岸带地区狗尾草内稳性缓解P限制

钟小瑛^1,2, 任奕炜¹, 衣华鹏¹, 祝贺², 高猛³

作者信息 +

Homeostasis of Setaria viridis (L.) Beauv. in Yantai coastal zone alleviated P limitation

ZHONG Xiao-ying^1,2, REN Yi-wei¹, YI Hua-peng¹, ZHU He², GAO Meng³

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摘要

为探究不同海岸梯度上狗尾草（Setaria viridis （L.） Beauv.）养分利用及对环境的适应策略，以烟台砂质海岸防护林下的狗尾草为研究对象，对狗尾草叶片和土壤养分含量进行分析，并探讨叶片化学计量特征和内稳性特征与土壤之间的关系.结果表明，不同海岸梯度上狗尾草叶片和土壤养分含量及化学计量特征存在一定梯度响应；研究区土壤P含量极低，狗尾草叶片P-N：P（叶片氮磷比）>16，狗尾草生长发育更多受到P元素的限制；狗尾草叶片P-C（叶片有机碳），P-P（叶片全磷），P-C：N（叶片碳氮比），P-C：P（叶片碳磷比）和P-N：P（叶片氮磷比）为绝对稳态，1/H（P-N）（叶片全氮的内稳性系数）为0.26，属于弱稳态型，与N和P元素相比，N：P更稳定，狗尾草在生长过程中按一定比例调控自身营养元素；研究区内狗尾草主要受P元素限制，但整体上内稳性较高，说明狗尾草适应性极强，可以在多变的环境中维持体内化学计量的动态平衡，缓解海岸带地区P限制的影响，在贫瘠的环境中缓慢生长.

Abstract

In order to explore the nutrient utilization and environmental adaptation strategies of Setaria viridis (L.) Beauv. on different coastal gradients, this paper analyzed the nutrient content of Setaria viridis leaves and soil under the sandy coastal shelter forest in Yantai, and discussed the relationship between leaf stoichiometry characteristics and endostabilizing characteristics and soil. The results showed that there was a certain response in the leaf and soil nutrient content and stoichiometric characteristics of Setaria viridis on different coastal gradients. The soil P content in the study area was extremely low, and more specifically the leaves of Setaria viridis grass P-N:P(leaf nitrogen-phosphorus ratio)>16. The growth and development of Setaria viridis were more limited by the P element. Moreover, P-C (leaf organic carbon), P-P (leaf total phosphorus), P-C:N (leaf carbon-nitrogen ratio), P-C:P (leaf carbon-phosphorus ratio) and P-N:P(the leaf nitrogen-phosphorus ratio) were all in absolute steady state. 1/H(P-N) (the internal stability coefficient of leaf total nitrogen) was 0.26, which belonged to the weak steady state type, but N:P was more stable than N and P elements. It is concluded that Setaria viridis regulate its nutrients in a certain proportion during the growth process. In the study area, Setaria viridis was mainly limited by the P element, but the overall internal stability was high indicating that Setaria viridis was highly adaptable in the coastal environment. It could maintain the dynamic balance of stoichiometry in vivo in a changeable environment, and alleviate the influence of P restriction in coastal areas with a low growing rate.

导出引用

钟小瑛, 任奕炜, 衣华鹏, 祝贺, 高猛. 烟台海岸带地区狗尾草内稳性缓解P限制[J]. 中国环境科学. 2023, 43(10): 5498-5507

ZHONG Xiao-ying, REN Yi-wei, YI Hua-peng, ZHU He, GAO Meng. Homeostasis of Setaria viridis (L.) Beauv. in Yantai coastal zone alleviated P limitation[J]. China Environmental Science. 2023, 43(10): 5498-5507

中图分类号： X173

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