马尾松人工幼林营养综合诊断

Studies on Nutrient Synthetic Diagnosis for Pinus massoniana Young Plantation

采用DRIS诊断法对广西6~8 a生马尾松Pinus massoniana人工幼林高、低产组针叶进行营养诊断,测定10种矿质营养元素(N、P、K、Ca、Mg、Zn、Fe、Cu、Mn和B)的含量,探讨马尾松人工幼林养分需求规律,制定马尾松人工幼林养分平衡诊断标准。结果表明:广西马尾松人工幼林的需肥顺序为P> B> K> Zn> N> Mn> Mg> Fe> Ca> Cu,最缺乏的元素是P,其次是B、K、N、Zn,最不缺乏的是Ca、Cu。针叶N、P、K元素浓度比值范围为N/P=12.81±3.75、N/K=2.62±0.30、P/K=0.22±0.08。马尾松工幼林叶片养分适宜范围为:N 9.36~15.44、P 0.72~1.29、K 3.84~5.63、Ga3.65~5.63、Mg 0.31~1.53 g·kg-1、Cu 2.14~3.01、Zn 20.66~66.42、Fe 30.26~203.19、Mn 330.02~561.38、B1.13~15.71 mg·kg-1。根据该诊断标准可有效诊断马尾松针叶营养元素丰缺程度,指导林农"对症下药",实现精准施肥。

The DRIS was used to diagnose the high and low yield types of 6~8 year old Pinus massoniana plantation in Guangxi. 10 kinds of mineral nutrients(N,P,K,Ca,Mg,Zn,Fe,Cu,Mn,B) were determined,the nutrient requirement characteristics of P. massoniana young plantation was studied,and the nutrient balance diagnostic standard was established. The results showed that the sequence of nutrition requirements in P. massoniana young plantation was P > B > K > Zn > N > Mn > Mg > Fe > Ca >Cu.The DRIS diagnostic results indicated that the most de?cient leaves elements were phosphorus,followed by boron,potassium,nitrogen and zinc,and the most wealthy elements were Ca and Cu. The optimal N/P,N/K and P/K ratios were 12.81 ±3.75,2.62±0.30,0.22±0.08 respectively. The suitable concentration ranges of N,P,K,Ca,Mg,Cu,Zn,Fe,Mn and B were 9.36~15.44,0.72~1.29,3.84~5.63,3.65~5.63, 0.31~1.53 g · kg-1,2.14~3.01, 20.66~66.42, 30.26~203.19,330.02~561.38,1.13~15.71 mg · kg-1,and those diagnostic standard could judge the main mineral nutrient level status in leaves to guide farmers to "suit the remedy to the case",and achieve scienti?c and accurate fertilization.