紫色土区不同治理措施下芒萁各器官生态化学计量特征

Ecological Stoichiometric Characteristics of Various Organs of Dicranopteris dichotoma with the Different Management Measures at the Purple Soil Area

为探索紫色土区不同治理措施下芒萁各器官生态化学计量特征,选取不同治理措施的径流小区,采集芒萁和土壤,分析芒萁化学计量特征及其与土壤养分之间的关系。结果表明:①不同治理措施下,芒萁各器官总C含量较为均匀;全N、全P差异均较显著,总体表现规律均为叶片〉枯叶〉叶柄〉地下茎根。②芒萁各器官间C/N总体表现为地下茎根〉叶柄〉枯叶〉叶片;N/P总体表现为枯叶〉叶片〉叶柄〉地下茎根;C/P不均匀,总体表现为叶柄和地下茎根较高,叶片较低。③不同治理措施下芒萁各器官养分仅有P与根际土之间的相关程度较高,说明在不同治理措施下限制芒萁各器官生长发育的主要因素是土壤P。本研究结果可为紫色土区的水土流失治理提供科学参考。

The runoff plots with different management measures were selected for the collection of the Dicranopteris dichotoma and soil to analyze the relationship between the stoichiometric characteristics and the soil nutrient so as to explore the ecological stoichiometric characteristics of various organs of Dicranopteris dichotoma with the different management measures at the purple soil area.The results showed that,①under the different management measures,the content of total C at various organs of Dicranopteris dichotoma was relatively even while both the total N and total P had significant differences,with the overall performance rules ranking as leaves>withered leaf>petiole>underground stem and root.②The overall distribution rule of C/N at the various organs of Dicranopteris dichotoma appeared as underground stem and root>petiole>withered leaf>leaves,and the overall distribution rule of N/P appeared as withered leaf>leaves>petiole>underground stem and root.The C/P at various organs of Dicranopteris dichotoma is not even,mainly concentrated at petiole and underground stem and root.The value of C/P was lower at the leaves of Dicranopteris dichotoma.③Of all the nutrients at various organs of Dicranopteris dichotoma under the different management measures,only P value had higher degree of correlation with the rhizosphere soil,which explained that P in soil was the main factor restricting the growth of various organs of Dicranopteris dichotoma.The study results may provide the scientific reference for the soil erosion control in the purple soil area.