文献类型：期刊文献

中文题名：高寒沙地2种密度沙柳人工林叶片、枝条和土壤养分特征

英文题名：Leaves,branches and soil nutrient characteristics of 2 density Salix psammophila plantations on alpine sandy land

作者：李清雪[1,2] 贾志清[1,2,3] 何凌仙子[1,2] 张佳鹏[4] 赵雪彬[2] 羊秀本[2]

第一作者：李清雪

机构：[1]中国林业科学研究院生态保护与修复研究所,北京100091;[2]青海共和荒漠生态系统定位观测研究站,共和813005;[3]中国林业科学研究院林业研究所,北京100091;[4]中国科学院东北地理与农业生态研究所,长春130102

年份：2025

卷号：45

期号：18

起止页码：9230-9241

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划项目(2022YFF1302503-2);青海共和盆地柠条防沙固沙低效林复壮技术示范与推广(QSCZ-2024-004)。

语种：中文

中文关键词：高寒沙地;沙柳人工林;密度;养分元素;化学计量比

外文关键词：alpine sandy land;Salix psammophila plantations;density;nutrient element;stoichiometric ratio

分类号：S718.5

摘要：以青海共和盆地高寒沙地2种密度衰退沙柳人工林为研究对象,测定叶片、枝条和土壤养分含量,并计算其化学计量比,分析植物和土壤的养分含量及其化学计量比之间的关系,揭示人工林生长的主要限制因素,为高寒沙区植被恢复与重建及可持续经营提供理论依据。结果表明:(1)高密度林叶片和枝条的C、N、P、K含量都高于低密度林,C∶N、C∶P、C∶K低于低密度林,说明低密度林对N、P、K元素的利用效率较高。(2)2种密度人工林叶片的N∶P分别为18.37和19.11,林木生长都受到P元素的限制。(3)低密度林3个土壤深度的SOC、TN和AK含量都明显高于高密度林,AN和AP含量及pH值明显低于高密度林,对土壤养分指标的综合评价结果为低密度林土壤质量指数较高。低密度林3个深度土壤的C∶P(0—20cm除外)和N∶P都明显高于高密度林,C∶N明显低于高密度林,说明低密度林提高了N的有效性,降低了P的有效性,P对低密度林生长的限制性更强。(4)RDA分析表明,土壤TN(0—60cm)和AK(40—60cm)含量对沙柳叶片的C、N、P、K含量及其化学计量比的解释程度最高,且都达到显著水平(P<0.05),土壤TN和AK含量与沙柳C、N、P、K含量呈负相关关系。
This study was conducted in the declining Salix psammophila plantations on the alpine sandy land of Gonghe Basin,Qinghai Province.Two density plantations were selected,the initial plant spacing and row spacing were 80×120 cm(high density plantation)and 100×200 cm(low density plantation),respectively.The nutrient content of leaves,branches and soil in three depths(0—20,20—40 and 40—60 cm)were measured and their stoichiometric ratios were calculated.The relationship between plant nutrient content and their stoichiometric ratio and soil was analyzed to reveal the main limiting factors of plantation growth,in order to provide theoretical basis for vegetation restoration and reconstruction in alpine sandy region.The results showed that:(1)The content of C,N,P and K in leaves and branches of high density plantation were observably higher than those of low density plantation,and the C∶N,C∶P and C∶K were observably lower than those of low density plantation,indicating that low density plantation had higher utilization efficiency of N,P and K elements.(2)The leaves N∶P of the two density plantations were 18.37 and 19.11,respectively,indicating that the growth of S.psammophila was limited by P element.(3)The content of SOC,TN and AK in the three soil depths of low density plantation were higher than those of high density plantation,and the content of AN,AP and pH were observably lower than those of high density plantation.The comprehensive evaluation on soil properties showed that low density plantation with higher soil quality index.The C∶P(except 0—20 cm)and N∶P in the three soil depths of low density plantation were observably higher than those of high density plantation,and C∶N was observably lower than that of high density plantation,indicating that low density plantation improved the availability of N,decreased the availability of P,and P was more restrictive to the growth of low density plantation.RDA analysis showed that soil TN(0—60 cm)and AK(40—60 cm)content had the highest interpretation degree on C,N,P and K contents and their stoichiometric ratios of S.psammophila leaves,and both reached significant levels(P<0.05).Soil TN and AK content were negatively correlated with C,N,P and K content in S.psammophila.