白刺沙堆周围土壤理化性状的空间分布特征

发布时间：2018-04-14 08:32

本文选题：白刺沙堆 + 肥岛效应　；参考：《北方园艺》2016年10期

【摘要】：为了探讨沙堆灌丛植被"肥岛"效应影响下土壤养分的空间分布特征,以宁夏东部荒漠灌丛白刺为研究对象,对沙堆不同生境,不同土层的pH、全盐和碳氮磷含量及其比值进行了研究。结果表明:白刺沙堆土壤pH和全盐均随土层的加深而升高,相对于pH,全盐的升高更为显著(P0.05),有机碳(SOC)、全氮(TN)和全磷(TP)随土壤深度的增加总体上呈逐渐降低的趋势,在土壤表层(0~40cm),3种生境下土壤养分含量为冠下冠缘灌丛间地,TP相对于SOC和TN在不同生境、不同土层间变化不显著(P0.05);在表层土壤(0~20cm)处,沙堆冠下土壤的碳氮比(C/N)、碳磷比(C/P)和氮磷比(N/P)呈极显著增加趋势;离植株不同距离的3种生境下,白刺沙堆土壤的C/N、C/P和N/P几乎无明显的规律性,经方差分析可知,土层对SOC和TN影响显著(P0.05),对TP无影响(P0.05),距离仅对SOC有显著影响,而距离与土层的交互作用对三者均有显著影响(P0.05)。白刺沙堆土壤pH和全盐对C/N、C/P、N/P的贡献为正,SOC、TN和TP对C/N的贡献均为负。
[Abstract]:In order to study the spatial distribution characteristics of soil nutrients under the effect of "fertilizer island" effect on sandy thicket vegetation, the desert shrub of eastern Ningxia was used as the research object, and the different habitats of sand pile were studied.The pH, total salt, carbon, nitrogen and phosphorus contents and their ratios in different soil layers were studied.The results showed that the soil pH and total salt increased with the deepening of soil layer. Compared with pH, the increase of total salt was more significant (P 0.05), organic carbon (SOC), total nitrogen (TNN) and total phosphorus (TP)) decreased gradually with the increase of soil depth.The soil nutrient contents in the three habitats of the topsoil were as follows: compared with SOC and TN in different habitats, there was no significant change of TP in different soil layers, but at 20 cm in topsoil soil, there was no significant difference between TP and SOC and TN in different habitats.The C / N ratio (C / N), C / P ratio (C / P) and N / P ratio (N / P) of the soil under the crown of sand pile showed a very significant increasing trend. Under three habitats with different distances from the plant, the C / N / C / P and N / P of the soil of the Sand pile had almost no obvious regularity, and the analysis of variance showed that the C / N / N / P and N / P of the soil had no obvious regularity.The effect of soil layer on SOC and TN was significant (P0.05N), but on TP (P0.05N) was not. Distance only had significant effect on SOC, while the interaction between distance and soil layer had significant influence on the three factors.The contribution of pH and total salt to the C / N / P / P ratio in the soil of the Spurs sand pile is negative. The contribution of TN and TP to C / N is both negative.
【作者单位】：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;宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地;宁夏大学西部生态与生物资源开发联合研究中心;宁夏大学科学技术处;
【基金】：国家自然科学基金资助项目(31460123;41101301;31260581) 教育部科学技术研究资助项目(413060)
【分类号】：S151.9

【相似文献】