云南松苗木氮磷钾储量在针叶与单株间转换研究

Scaling from leaf to whole plant in nitrogen,phosphorus and potassium reserve of Pinus yunnanensis seedlings

【目的】植物的营养分配可反映其物质和能量策略,但测定植株各器官营养分配模式较为繁琐。基于各器官间含量相关性可构建估测模型,利用易采样测定器官估测单株的营养含量,为快速评估苗木氮磷钾含量提供途径。【方法】以云南松苗木为研究对象,按根、茎、针叶3种器官进行生物量、氮含量、磷含量、钾含量测定,以易采样器官--针叶为变量,构建云南松苗木单株生物量(Mp)、单株氮储量(NRp)、单株磷储量(pRp)和单株钾储量(KR_(P))估测模型,分析云南松苗木针叶生物量与单株生物量、单株生物量与单株氮储量、单株磷储量、单株钾储量间的缩放关系,阐明云南松苗木单株生物量与单株氮储量、单株磷储量、单株钾储量间的相关关系。【结果】云南松苗木针叶生物量(ML)经对数转换后能很好地拟合单株生物量(R^(2)=0.9988,P<0.01),单株生物量Mp=ML+10^(-0.235)M^(-0.300)_(L)+10^(-0.334)M^(0.598)_(L);利用针叶氮含量(N_(L))、磷含量(P_(L))、钾含量(K_(L))也能分别很好地拟合单株氮储量、单株磷储量、单株钾储量,其拟合模型分别为单株氮储量NRp=M_(L)N_(L)+10^(-0.235)M^(0.300)_(L)(-0.1942N_(L)+4.3979)+10^(-0.334)M^(0.598)_(L)(-0.3337 N_(L)+7.2187)、单株磷储量pRp=M_(L)P_(L)+10^(-0.235)M^(0.300)_(L)(0.0120 P_(L)+0.9744)+10^(-0.334)M^(0.598)_(L)(0.0841P_(L)+1.1340)、单株钾储量KR_(P)=M_(L)K_(L)+10^(-0.235)M^(0.300)_(L)(0.1318^(K)_(L)+7.4434)+10^(-0.334)M^(0.598)_(L)(0.1051^(K)_(L)+6.4952)。利用实测数据也进一步验证了模型能较好地估测相应指标。【结论】以针叶器官生物量、养分含量为变量,构建的模型能很好地估测云南松单株生物量、单株氮储量、单株磷储量和单株钾储量,为快速估测提供了途径。

[Objective]The nutrient allocation of plants can reflect their material and energy strategies,but it is cumbersome to determine the nutrient allocation mode of each organ of the plant.An estimation model can be constructed based on the content correlation between various organs,which can be used to estimate the nutrient content of a single plant using easily sampled organs and provide a way to quickly evaluate the nitrogen,phosphorus and potassium content of seedlings.[Method]Taking Pinus yunnanensis seedlings as the research object,the biomass,nitrogen content,phosphorus content,and potassium content were measured according to three organs:Root,stem,and needle.Estimation models of seedling biomass per plant(Mp),nitrogen storage per plant(NRp),phosphorus storage per plant(pRp)and potassium storage per plant(KRp)were constructed.The scaling relationships between needle leaf biomass and single plant biomass of P.yunnanensis seedlings,the biomass of a single plant and the nitrogen storage of a single plant,the phosphorus storage of a single plant,and the potassium storage of a single plant were analyzed.The correlations between the biomass of a single plant of P.yunnanensis seedlings and the storage of nitrogen,phosphorus storage of a single plant,and potassium storage of a single plant were clarified.[Result]The needle leaf biomass(M_(L))of P.yunnanensis seedlings could well fit the biomass of individual plants after logarithmic transformation(R^(2)=0.9988,P<0.01),and Mp=M_(L)+10^(-0.235)M^(0.300)_(L)+10^(-0.334)M^(0.598)_(L).Using the nitrogen content(N_(L)),phosphorus content(P_(L))and potassium content(K_(L))of needles could also be used to fit the nitrogen storage per plant,the phosphorus storage per plant,potassium storage per plant,respectively,and the fitting models were:NRp=M_(L)N_(L)+10^(-0.235)M^(0.300)_(L)(-0.1942N_(L)+4.3979)+10^(-0.334)M^(0.598)_(L)(-0.3337N_(L)+7.2187),pRp=M_(L)P_(L)+10^(-0.235)M^(0.300)_(L)(0.0120P_(L)+0.9744)+10^(-0.334)M^(0.598)_(L)(0.0841P_(L)+1.1340),and KR_(P)=M_(L)K_(L)+10^(-0.235)M^(0.300)_(L)(0.1318K_(L)+7.4434)+10^(-0.334)M^(0.598)_(L)(0.1051K_(L)+6.4952).Using the measured data to further verify that model could better estimate the corresponding indicators.[Conclusion]The model constructed by taking the biomass and nutrient content of coniferous organs as variables can well estimate the biomass,nitrogen storage,phosphorus storage and potassium storage for P.yunnanensis plant,which is an important method for rapid estimation.