湿地松幼林营养的DRIS诊断  

Nutrient Diagnosis on Young Stands of Slash Pine by DRIS

作　　者：洪顺山[1] 庄珍珍 胡炳堂[1] 李锦清 余建新 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江省余杭县长乐林场

出　　处：《林业科学研究》1995年第4期360-366,共7页Forest Research

基　　金：国家攻关项目林木施肥专题

摘　　要：用ＤＲＩＳ和临界浓度值法对湿地松幼林的营养状态比较研究发现，在诊断针叶磷素营养状态时，用ＤＲＩＳ法比临界浓度值法更准确。施用磷肥能显著地提高湿地松幼林生长量，并与ＤＲＩＳ措数密切相关；但与叶片中磷的浓度相关不显著。植株从磷肥吸收的磷量被林分生长的“稀释效应”所抵消，使施磷植株叶片中磷的浓度没有明显提高。同临界浓度值法一样，ＤＲＩＳ法也受林龄和立地环境因素的影响，故用于计算诊断参数的高产群体应当从当地的同龄林选择。根据ＤＲＩＳ的诊断结果，江西永丰低丘红壤湿地松造林施肥的效应机理为：氮肥增加针叶Ｎ素的过量积累，加剧了养分的不平衡状态，对生长无益。单施钙镁磷肥，每公顷施纯磷２１．８２ｋｇ，就可全面改善幼林的营养状态，使主要养分元素Ｎ、Ｐ、Ｃａ、Ｍｇ达到理想的平衡状态，显著促进幼林生长。钾肥提高幼林钾的吸收量，但可能属奢侈吸收状态，对生长无影响。A comparative nutrient diagnosis on young stands of slash pine by DRIS andcritical concentration value approach(CCVA)was conducted.The results showed that theDRIS produced more accurate nutritional diagnosis than that by CCVA when diagnosingphosphorus nutritional status in leaves. That is ,the phosphorus application enhanced thegrowth of slash pine and the growth was significantly interrelated to phosphorus DRIS in-dexes,but there was no response for phosphorus concentration in leaves. DRIS diagnosis wasalso influenced by the age of trees and site environment as the CCVA. So, high-yield popula-tions for calculating diagnosis parameter should be chosen from the stands of the same age atthe local site. According to the diagnosis results by DRIS,the mechanism of N P K fertilizersto the growth of young slash pine was considered as follows :N application increased the Nconcentration and the unbalance of leaf nutrition and was not benefitable to the growth.Theapplication of calcium-magnesium phosphate alone at the rate of P 21.82 kg/hm2 would im-prove the N,P,Ca and Mg nutritional status in leaves significantly, reaching the optimumbalance. Besides,it was found that P nutritional status in the control treatment was obvious-ly improved in the third year after planting,indicating the young trees were able to use soil Pto meet the need of P for their growth.

关 键 词：湿地松幼林 营养诊断 肥效机理 磷肥 

分 类 号：S791.246[农业科学—林木遗传育种]