为揭示呼伦贝尔沙地樟子松根际与非根际土壤碳氮磷化学计量特征,以不同林龄(28、37、46年生)樟子松人工林为研究对象,以樟子松天然林为对照,研究根际与非根际土壤有机碳、全氮和全磷含量及其化学计量比,分析土壤性质与土壤化学计量特征间的相关性.结果表明:在樟子松人工林中,根际效应显著影响土壤N∶P,林龄显著影响土壤有机碳含量;各林龄人工林的土壤有机碳含量均显著低于天然林.人工林的根际与非根际土壤有机碳、全氮含量均随林龄增加先降低再升高;全磷含量在根际土壤中先升高再降低,在非根际土壤中先降低再升高.C∶N与C∶P在根际土壤中呈显著正相关,但在非根际土壤中不存在显著相关关系,说明根际土壤氮磷限制具有更高的协同性.根际与非根际土壤N∶P均值分别为4.98与8.40,表明樟子松人工林的生长受土壤N限制,且根际土壤受N限制程度更高.根际与非根际土壤碳氮磷化学计量特征受土壤性质的显著影响,其中,速效磷是最主要的驱动因子.呼伦贝尔沙地樟子松生长受N限制,其植物根系对土壤养分的富集与维持有明显作用,建议在樟子松生长阶段适当补充土壤氮素,并根据根际土壤氮磷限制的协同性适当补充磷素.
The aim of this study was to reveal the stoichiometric characteristics of carbon,nitrogen and phosphorus in rhizosphere and non-rhizosphere soils of Pinus sylvestris var.mongolica in the Hulunbuir desert.We investigated the contents and stoichiometry of organic carbon,total nitrogen,and total phosphorus contents of rhizosphere and non-rhizosphere soils across different stand ages(28,37 and 46 a)of P.sylvestris var.mongolica plantations,with P.sylvestris var.mongolica natural forest as the control.We analyzed the correlation between soils properties and soil stoichiometry.The results showed that rhizosphere effect significantly affected soil N∶P,and stand age signifi-cantly affected soil organic carbon content in P.sylvestris var.mongolica plantation.Soil organic carbon content in plantation was significantly lower than that in natural forest.Soil organic carbon and total nitrogen contents of plan-tations in both rhizosphere and non-rhizosphere soils firstly decreased and then increased with increasing stand age,while total phos ph orus firstly increased and then decreased in rhizosphere soils,and firstly decreased and then in-creased in non-rhizosphere soils.There was significant positive correlations between C∶N and C∶P in rhizosphere soils but not in non-rhizosphere soils,suggesting that higher synergistic rhizosphere soil N and P limitation.The mean N∶P values of rhizosphere and non-rhizosphere soils were 4.98 and 8.40,respectively,indicating that the growth of P.sylvestris var.mongolica was restricted by soil N and the rhizosphere soils were more N-restricted.The C∶N∶P stoichiometry of rhizosphere and non-rhizosphere soils were significantly influenced by soil properties,with available phosphorus being the most important driver.The growth of P.sylvestris var.mongolica was limited by N in the Hulunbuir desert,and root system played an obvious role in enriching and maintaining soil nutrients.It was rec-ommended that soil nitrogen should be supplemented appropriately during the growth stage of P.sylvestris var.mongolica plantation,and phosphorus should be supplemented appropriately according to the synergistic nature of nitrogen and phosphorus limitation.
刘一麟;任悦;高广磊;丁国栋;张英;柳叶
北京林业大学水土保持学院,北京 100083北京林业大学水土保持学院,北京 100083||林木资源高效生产全国重点实验室,北京 100083||宁夏盐池毛乌素沙地生态系统国家定位观测研究站,宁夏盐池 751500||林业生态工程教育部工程研究中心,北京 100083||水土保持国家林业和草原局重点实验室,北京 100083北京林业大学水土保持学院,北京 100083||宁夏盐池毛乌素沙地生态系统国家定位观测研究站,宁夏盐池 751500||林业生态工程教育部工程研究中心,北京 100083||水土保持国家林业和草原局重点实验室,北京 100083
樟子松;生态化学计量;土壤;根际效应;林龄
Pinus sylvestris var. mongolica;ecological stoichiometry;soil;rhizosphere effect;stand age
《应用生态学报》 2024 (003)
615-621 / 7
本文由国家自然科学基金项目(32371962)资助.
10.13287/j.1001-9332.202403.005
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