Variation characteristics of soil stoichiometric ratio under the canopy of Kalidium caspicum

doi:10.6048/j.issn.1001-4330.2024.12.025

Abstract

Abstract:

【Objective】 In order to verify whether the individual sizes, spatial positions and sampling directions of shrubs have an effect on the stoichiometric ratio of soil under their canopy.【Methods】 In this study, four Kalidium caspicum individuals with different individual sizes were selected in the northwestern margin of the Junggar Desert.Soil samples of 0-10 cm and 10-20 cm were collected at four different sampling directions (east, south, west, north) and four spatial positions (shrub center, shrub middle, shrub edge and shrub outside).Based on the determination of organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) contents, the effects of individual size, spatial position and sampling direction on soil C/N, C/P and N/P changes were analyzed.【Results】 The soil C/N, C/P and N/P showed a decreasing trend from the shrub center to the shrub outside under the canopy of K.caspicum.Among them, C/N in the 10-20 cm soil layer under the canopy of the smaller individual K.caspicum showed the shrub center 13.6% higher than the shrub middle; there were significant differences in C/P between different spatial positions in 0-10 cm and 10-20 cm soil layers, and the shrub center C/P in 10-20 cm soil layer was 15.6%-16.3% higher than that in shrub outside; N/P showed that in the 10-20 cm soil layer, the shrub center of the large individual was 1.3 times that of the shrub edge, and the shrub middle of the small individual was significantly higher than that of the shrub center by 40%.Soil SOC, TN,TP and soil stoichiometry showed a good correlation (P<0.01).【Conclusion】 C/P and N/P become nutrient limiting indicators in this area.

Key words: shrub individual sizes; spatial positions; sampling directions; soil stoichiometry; Kalidium caspicum

摘要：

【目的】 验证灌木个体大小、空间位置和采样方向对其冠下土壤化学计量比的影响。【方法】 在准噶尔荒漠西北缘选取4种个体大小不同的里海盐爪爪个体,在其冠下4个不同采样方向(东、南、西、北)和4个空间位置上(主根周围、冠幅中央、冠幅边缘和株间空地),分别采集0~10 cm和10~20 cm土壤样品,在测定有机碳(SOC)、全氮(TN)、全磷(TP)含量的基础上,分析个体大小、空间位置和采样方向对土壤C/N、C/P和N/P变化的影响。【结果】 里海盐爪爪冠下土壤C/N、C/P和N/P表现出由主根周围向株间空地逐渐递减的趋势。其中,C/N在较小个体里海盐爪爪冠下10~20 cm土层表现出主根周围高出冠幅中央13.6%;C/P在0~10 cm和10~20 cm土层各空间位置间均存在显著性差异,且10~20 cm土层主根周围C/P高出株间空地15.6%-16.3%;N/P在10~20 cm土层中表现为大个体里海盐爪爪主根周围是冠幅边缘的1.3倍,较小个体里海盐爪爪冠幅中央显著高出主根周围40%。土壤SOC、TN、TP与土壤化学计量比表现出显著的相关性(P<0.01)。【结论】 该区域C/N较为稳定,C/P与N/P成为该区域养分限制性指标。

关键词: 个体大小, 空间位置, 采样方向, 土壤化学计量比, 里海盐爪爪

CLC Number:

YUAN Ruyi, HAN Zhili, PAN Siyao, MA Hongyu, HUANG Cheng, ZHAO Dan, CHENG Junhui. Variation characteristics of soil stoichiometric ratio under the canopy of Kalidium caspicum[J]. Xinjiang Agricultural Sciences, 2024, 61(12): 3097-3104.

袁如薏, 韩志立, 潘斯瑶, 马红钰, 黄铖, 赵丹, 程军回. 里海盐爪爪冠下土壤化学计量比变化特征[J]. 新疆农业科学, 2024, 61(12): 3097-3104.

Figures/Tables 5

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里海盐爪爪个体大小 plant individual sizes of Kalidium caspicum	冠幅面积 Capsicum crown area (m²)
大个体 Large individuals	1.06~12.69
中等个体 Medium individuals	0.63~1.05
小个体 Small individuals	0.33~0.62
较小个体 Relatively small individuals	0.05~0.32

里海盐爪爪个体大小 plant individual sizes of Kalidium caspicum	冠幅面积 Capsicum crown area (m²)
大个体 Large individuals	1.06~12.69
中等个体 Medium individuals	0.63~1.05
小个体 Small individuals	0.33~0.62
较小个体 Relatively small individuals	0.05~0.32

土层 Soil layers	指标 Indexes	log₁₀SOC	log₁₀ TN	log₁₀ TP	log₁₀ (C/N)	log₁₀ (C/P)
0~10 cm	log₁₀ TN	0.318^**
	log₁₀ TP	-0.193^**	-0.065
	log₁₀(C/N)	0.322^**	-0.795^**	-0.061
	log₁₀ (C/P)	0.955^**	0.303^**	-0.473^**	0.309^**
	log₁₀ (N/P)	0.346^**	0.979^**	-0.266^**	-0.756^**	0.389^**
10~20 cm	log₁₀ TN	0.465^**
	log₁₀ TP	-0.305^**	-0.219^**
	log₁₀(C/N)	0.404^**	-0.621^**	-0.045
	log₁₀ (C/P)	0.973^**	0.474^**	-0.514^**	0.373^**
	log₁₀ (N/P)	0.496^**	0.978^**	-0.415^**	-0.571^**	0.549^**

土层 Soil layers	指标 Indexes	log₁₀SOC	log₁₀ TN	log₁₀ TP	log₁₀ (C/N)	log₁₀ (C/P)
0~10 cm	log₁₀ TN	0.318^**
	log₁₀ TP	-0.193^**	-0.065
	log₁₀(C/N)	0.322^**	-0.795^**	-0.061
	log₁₀ (C/P)	0.955^**	0.303^**	-0.473^**	0.309^**
	log₁₀ (N/P)	0.346^**	0.979^**	-0.266^**	-0.756^**	0.389^**
10~20 cm	log₁₀ TN	0.465^**
	log₁₀ TP	-0.305^**	-0.219^**
	log₁₀(C/N)	0.404^**	-0.621^**	-0.045
	log₁₀ (C/P)	0.973^**	0.474^**	-0.514^**	0.373^**
	log₁₀ (N/P)	0.496^**	0.978^**	-0.415^**	-0.571^**	0.549^**