紫花苜蓿生物量分配对植物-土壤化学计量的响应

doi:10.11733/j.issn.1007-0435.2023.04.024

草地学报 ›› 2023, Vol. 31 ›› Issue (4): 1143-1153.DOI: 10.11733/j.issn.1007-0435.2023.04.024

• 研究论文 • 上一篇

紫花苜蓿生物量分配对植物-土壤化学计量的响应

刘育书¹, 曹岭¹, 余舟昌¹, 田兴芳¹, 孙琳¹, 时嘉翊¹, 张伟¹, 谢治国², 雷秀云², 俞靓², 杨培志¹

1. 西北农林科技大学草业与草原学院, 陕西杨凌 712100;
2. 陕西省林业科学院, 陕西西安 710082

收稿日期:2022-11-04 修回日期:2022-12-30 发布日期:2023-04-28
通讯作者: 杨培志,E-mail:mailto:yangpeizhi@126.com
作者简介:刘育书(1997-),男,汉族,内蒙古土默特左旗人,硕士研究生,主要从事草地生态学研究,E-mail:lys@nwafu.edu.cn
基金资助:
陕西林业科技创新专项(SXLK2022-02-14)；陕西省重点研发计划(No. 2022SF-285)资助

Response of Alfalfa Biomass Allocation to Plant-Soil Stoichiometry

LIU Yu-shu¹, CAO Ling¹, YU Zhou-chang¹, TIAN Xing-fang¹, SUN Lin¹, SHI Jia-yi¹, ZHANG Wei¹, XIE Zhi-guo², LEI Xiu-yun², YU Liang², YANG Pei-zhi¹

1. College of Grassland Agriculture, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
2. Shaanxi Academy of Forestry, Xian, Shaanxi Province 710082, China

Received:2022-11-04 Revised:2022-12-30 Published:2023-04-28

摘要/Abstract

摘要： C∶N∶P化学计量学在植物-土壤养分分配研究中应用广泛，但如何运用化学计量学方法来探究植物地上地下生物量分配还需要进一步研究。本研究选取榆林地区种植1 a，3 a，5 a，7 a和9 a的紫花苜蓿(Medicago sativa L.)人工草地，测定了紫花苜蓿的地上、地下生物量，土壤理化性质及碳氮磷含量，分析了植物-土壤C∶N∶P化学计量特征及其对紫花苜蓿地上、地下生物量和根冠比变化的响应。结果表明，紫花苜蓿人工草地土壤C∶N，C∶P和N∶P随种植年限延长均而增加，紫花苜蓿植株C∶N，C∶P和N∶P随种植年限延长均呈现先增加后降低变化趋势。种植1~5 a紫花苜蓿种植受N限制，种植7~9 a紫花苜蓿受P限制，紫花苜蓿通过增加自身根冠比来应对日益增强的N∶P，同时庞大的根系使得土壤肥力得到改善。

关键词: 紫花苜蓿, 化学计量特征, 生物量, 根冠比

Abstract: C:N:P stoichiometry is widely used in plant-soil nutrient partitioning studies,but how to use stoichiometry to investigate plant above- and under-ground biomass partitioning needs further study. In this studies,the above- and under-ground biomass,soil physicochemical properties and carbon,nitrogen and phosphorus contents of alfalfa were determined by selecting an artificial farmland of alfalfa cultivated in Yulin region for 1,3,5,7 and 9 years. The plant-soil C∶N∶P stoichiometric characteristics and their responses to changes in above- and below-ground biomass and root-shoot ratio of alfalfa were analyzed. The results showed that the C∶N,C∶P and N∶P of soils of the artificial farmland increased with the extension of alfalfa planting years,and the C∶N,C∶P and N∶P of alfalfa showed a trend of increasing and then decreasing with the extension of their growth years. Planting for 1 to 5 years,the alfalfa growth is limited by N,planting for 7 to 9 years,the alfalfa is limited by P. Alfalfa may adapt the enhanced N∶P ratio of soil by increasing its own ratio of root to shoot,while the enlarged root system makes the nutrient utilization improved at a degree of soil fertility.

Key words: Alfalfa, Stoichiometric characteristics, Biomass, Root-shoot ratio

中图分类号:

S812

刘育书, 曹岭, 余舟昌, 田兴芳, 孙琳, 时嘉翊, 张伟, 谢治国, 雷秀云, 俞靓, 杨培志. 紫花苜蓿生物量分配对植物-土壤化学计量的响应[J]. 草地学报, 2023, 31(4): 1143-1153.

LIU Yu-shu, CAO Ling, YU Zhou-chang, TIAN Xing-fang, SUN Lin, SHI Jia-yi, ZHANG Wei, XIE Zhi-guo, LEI Xiu-yun, YU Liang, YANG Pei-zhi. Response of Alfalfa Biomass Allocation to Plant-Soil Stoichiometry[J]. Acta Agrestia Sinica, 2023, 31(4): 1143-1153.

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紫花苜蓿生物量分配对植物-土壤化学计量的响应

Response of Alfalfa Biomass Allocation to Plant-Soil Stoichiometry

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