C, N, P Stoichiometric Characteristics of Different Dominant Species in Stipa Breviflora Desert Steppe

Yu Ruixin; Wang Lei; Yang Xinguo; Tian Na; Wang Xing; Song Naiping

doi:10.13961/j.cnki.stbctb.2019.04.006

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C, N, P Stoichiometric Characteristics of Different Dominant Species in Stipa Breviflora Desert Steppe

- C, N, P Stoichiometric Characteristics of Different Dominant Species in Stipa Breviflora Desert Steppe
- Bulletin of Soiland Water Conservation Vol. 39, Issue 4, Pages: 36-43(2019)
- 作者机构：
  
  1. 宁夏大学西北土地退化与生态系统恢复省部共建国家重点实验室培育基地,宁夏,银川,750021
  2. 宁夏大学西北退化生态系统恢复与重建教育部重点实验室,宁夏,银川,750021
  3. 南京大学国际地球系统科学研究所,江苏,南京,210093
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2019.04.006
  CLC： Q948.1
- Published：2019
- 稿件说明：
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Yu Ruixin, Wang Lei, Yang Xinguo, et al. C, N, P Stoichiometric Characteristics of Different Dominant Species in Stipa Breviflora Desert Steppe[J]. Bulletin of Soiland Water Conservation, 2019, 39(4): 36-43.
DOI：

Yu Ruixin, Wang Lei, Yang Xinguo, et al. C, N, P Stoichiometric Characteristics of Different Dominant Species in Stipa Breviflora Desert Steppe[J]. Bulletin of Soiland Water Conservation, 2019, 39(4): 36-43. DOI： 10.13961/j.cnki.stbctb.2019.04.006.

摘要

[目的]研究斑块中优势种的生活史策略及对养分限制的响应，以及优势种生态化学计量学特征随季节变化的响应规律，为植物种群演替及变化过程研究提供科学依据。[方法]确定3类典型斑块：斑块A （短花针茅）、斑块B （短花针茅+草木樨状黄耆）、斑块C （猪毛蒿+苦豆子+老瓜头），测定优势种的全碳、全氮、全磷含量，计算C：N，C：P，N：P并进行方差分析。采用线性回归分析法对不同斑块C，N，P化学计量进行逐步回归分析。[结果]各斑块优势种的C，N，P及其计量比特征在生长季内的变化规律不同，且各指标季节间的变化特征在不同斑块之间也存在差异；植物C含量在不同优势种和不同斑块间的差异均不显著；短花针茅N含量显著小于其他优势种，导致斑块A的N含量总体显著小于另外两个斑块；植物P含量在斑块A中随着季节的变化表现为增长的趋势，而在斑块C中表现为先减小后增大的变化过程；斑块A植物的C：N值无显著的季节变化，C：P和N：P值在春季显著高于夏秋季；斑块B和斑块C不同优势种的C：N，C：P和N：P值均表现出显著的差异性，但随季节变化过程不同，斑块B除C：N值外均表现出下降的趋势，而斑块C各比值均表现出先增大后减小的变化规律。[结论]3种斑块C，N，P含量表现出不同的相关性；斑块A表现为防御性策略，斑块B表现为竞争性策略，而斑块C表现为竞争性和防御性策略共存。

Abstract

[Objective] The life history strategies of dominant species in patches and their responses to nutrient restriction

stoichiometry characterization of dominant species were studied in response to seasonal variation

which was expected to provid a scientific basis for the study of plant population succession and change process.[Methods] 3 typical patches

patch A(Stipa breviflora)

patch B(Stipa breviflora+Astragalus melilotoides)

patch C(Artemisia scoparia+Sophora alopecuroides+Cynanchum komarovii) were recognized and in which the dominated species were sampled

and its total carbon

total nitrogen

and total phosphorus contents were measured. Ratios of C:N

C:P

N:P were calculated and analysis of their variances were conducted. Stepwise linear regression analysis of stoichiometry of the patches was performed.[Results] The results showed that the changes of carbon(C)

nitrogen(N)

phosphorus(P) and their stoichiometry characterization of the dominant species in three patches were different during the growing season

and the seasonal variation characteristics were also different among the three patchesseason. The contents of C among the dominant species

and among the patches as well

had no significant differences. N content of S. breviflora was lower than than the values of other dominant species

which resulted to the significantly smaller level of the N content in patch A. P content of patch A increased along the growing season

while of patch C

it experienced an initial decrease and a succeeding increased. For patch A plants

there was no significant seasonal variation in C:N values

the values of C:P and N:P were significantly higher in spring than those in summer and in autumn. C:N

C:P and N:P values of the dominant species in patches B and C had significant differences. However

the seasonal variation was different:for patch B all values decreased except of C:N value

C:N

C:P and N:P values of patch C all increased first and then decreased.[Conclusion] The C

and P contents of three patches showed different correlations

patch A showed a defensive strategy

patch B showed a competitive strategy

while patch C showed a coexistence of competitive and defensive strategies.

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