摘要
【目的】青海云杉是我国青藏高原东北边缘的特有树种,研究其天然更新对土壤物理性质的响应,从而为祁连山青海云杉次生林的恢复和管理及可持续利用提供基础理论依据。【方法】通过对分布在祁连山排露沟流域的青海云杉林设置海拔梯度固定样地,进行天然更新苗调查和土壤容重、水分、pH、有机碳、氮磷钾全量及其速效养分等理化性质的取样和测定,分析青海云杉林天然更新苗对土壤理化性质的响应。【结果】各海拔区段的青海云杉林更新指数从大到小依次为2 800~2 900 m(0.63)>2 700~2 800 m(0.58)>3 100~3 300 m(0.57)>2 900~3 100 m(0.56),其中更新状况最好的海拔区段是2 800~2 900 m。土壤质量含水量、有机碳、全氮、水解氮含量在海拔区段H_(1)和H_(2)处显著小于海拔区段H_(3)和H_(4)(P<0.05);土壤容重、pH、全钾和速效钾的含量在不同海拔区段之间的差异性不显著(P>0.05),土壤全磷和速效磷含量在海拔区段H_(2)显著大于其他海拔区段(P<0.05),其他海拔区段全磷差异性不显著(P>0.05),速效磷在海拔区段H_(4)含量最小,海拔区段H_(1)和H_(3)速效磷差异性不显著(P<0.05)。相关性分析表明,海拔区段2 800~2 900 m的更新指数仅与土壤容重、全磷、速效磷呈显著正相关(P<0.05),更新指数与土壤理化性质之间相关系数绝对值的最大值主要集中在该海拔区段。更新指数与土壤剖面不同土层的质量含水量、有机碳、全氮、水解氮均呈显著负相关(P<0.05),与容重、全磷含量均呈显著正相关(P<0.05);与20~40 cm土层的速效磷呈显著正相关(P<0.05)。主成分分析表明,土壤有机碳、速效磷和全磷含量是影响青海云杉林天然更新的主要因子。【结论】祁连山青海云杉林天然更新与土壤理化性质之间的相互作用是密切的,特别是土壤中的有机碳累积和磷素养分的释放。
【Objective】Picea crassifolia is a unique tree species on the northeastern edge of Qinghai-Tibet Plateau in our country,this study provides a theoretical basis for the restoration,management and sustainable utilization of P.crassifolia secondary forest in Qilian mountains.【Method】By setting up a fixed plot with an elevation gradient in the P.crassifolia forest distributed in the Pailugou valley of Qilian mountains,investigation of natural regeneration seedlings and sampling and determination of soil bulk density,water,pH,organic carbon,total N,p,K and their available nutrients were carried out,the response of natural regeneration seedlings ofP.crassifolia forest to soil physical and chemical properties was analyzed.【Result】The regeneration index of P.crassifolia forest at different altitudes was 2 800-2 900 m (0.63)>2 700-2 800 m (0.58)>3 100-3 300 m (0.57)>2 900-3 100 m (0.56),the best updated altitude was 2 800-2 900 m.Soil water content,organic carbon,total nitrogen,and hydrolyzed nitrogen in H_(1) and H_(2) were significantly lower than those in H_(3) and H_(4 )(P<0.05).Soil bulk density,pH,total potassium and available potassium had no significant difference (P>0.05).Soil total phosphorus and available phosphorus were significantly higher in H_(2) than in other altitudes (P<0.05),there was no significant difference in total phosphorus (P>0.05).The content of available phosphorus was the lowest in H_(4),and there was no significant difference in H_(1) and H_(3 )(P<0.05).The correlation analysis showed that the regeneration index of 2 800-2 900 m was only positively correlated with soil bulk density,total phosphorus and available phosphorus (P<0.05),the maximum of the absolute value of correlation coefficient between renewal index and soil physical and chemical properties mainly concentrated in this altitude region.The regeneration index was negatively correlated with soil water content,organic carbon,total nitrogen and hydrolyzed nitrogen (P<0.05),and positively correlated with bulk density and tot
作者
许尔文
牛赟
赵维俊
敬文茂
武秀荣
赵晶忠
马雪娥
任小凤
XU Erwen;NIU Yun;ZHAO Weijun;JING Wenmao;WU Xiurong;ZHAO Jingzhong;MA Xue’e;REN Xiaofeng(Gansu Qilian Mountains Forest Eco-system of the State Research Station,Gansu Province Academy of Water Resources Conservation Forest of the Qilian Mountains,Zhangye 734000,Gansu,China;Huaiyin Normal University,Huai’an 223300,Jiangsu,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2024年第7期90-100,共11页
Journal of Central South University of Forestry & Technology
基金
国家自然科学基金项目(32060247)
甘肃省中央引导地方科技发展资金项目(22ZY2QG001)
张掖市市级科技计划项目(ZY2022KY03)。
关键词
青海云杉林
天然更新
土壤理化性质
祁连山排露沟流域
Picea crassifolia forest
natural renewal
physical and chemical properties of soil
Pailugou watershed of Qilian mountains
