摘要
为探究施肥对水曲柳林木叶片光合特性的影响,以10年生水曲柳人工林为对象,测定氮磷施肥处理下水曲柳林木叶片的SPAD值、叶绿素含量和氮含量。结果表明,较高N肥及NP肥混施处理能够显著提高水曲柳林木叶片SPAD值、叶绿素含量和氮含量,而单施P肥对各指标的影响较小,但是P肥与N肥混施处理后叶片各指标显著提高,不同施肥处理最大值出现在N2P1处理;不同施肥处理下水曲柳叶片SPAD值与叶绿素和氮含量的变化趋势相似,且均显著相关,其中叶片SPAD值与单位干重叶绿素各组分含量的相关系数在单施P肥处理下最高,而叶片SPAD值与单位面积叶绿素各组分含量的相关系数在单施N肥处理下较高;叶片SPAD值与单位面积氮含量相关系数最大值出现在单施N肥处理下,而在单施磷肥处理下SPAD值仅与单位干重氮含量之间相关显著。以上结果表明:施氮磷肥后能够明显改善水曲柳林木叶片光合特征,而且水曲柳叶片SPAD值与叶绿素含量和氮含量紧密相关,是预测不同施肥条件下水曲柳叶片光合特征的有效手段。
To understand the responses of photosynthetic characteristics to fertilization,the SPAD value,chlorophyll content and nitrogen content of the leaves were measured in a 10-year old Fraxinus mandshurica plantation forest stand with nitrogen and phosphorus fertilization.The results showed that higher N additions and N+P additions significantly increased the SPAD value,chlorophyll content and nitrogen content of the leaves in Fraxinus mandshurica plantation forest stand.However,P fertilization had small influences on them.After mixed P and N fertilization,the leaf indexes increased significantly.The highest of SPAD value,chlorophyll content and nitrogen content were in the N2P1 treatment.SPAD values were significantly correlated with chlorophyll contents and nitrogen contents of leaves,and they showed the similar change in the different fertilization treatments.The correlation coefficients of SPAD values and chlorophyll content per mass were highest in only P addition.While the correlation coefficients of SPAD values and chlorophyll content per area were highest in only N addition.The highest correlation coefficient of SPAD value and nitrogen content per area was under only N addition.There was the only correlation of SPAD value and nitrogen content per mass under only P addition.These results suggested that the addition of N and P fertilization can regulate the photosynthetic characteristics of leaves in Fraxinus mandshurica plantation forest stand.SPAD value generally correlated with chlorophyll content and nitrogen content of leaves significantly.It is an effective method to predict the photosynthetic characteristics of Fraxinus mandshurica leaves under different fertilization conditions.
作者
张亚伟
孙海龙
郑鸿权
卫月华
ZHANG Yawei;SUN Hailong;ZHENG Hongquan;WEI Yuehua(School of Forestry,Northeast Forestry University,Harbin 150040,China;Shangzhi State-owned Forestry Center Management Bureau,Xiaojiu Forestry Center,Shangzhi 150600,China;Heilongjiang Jiamusi Forestry Bureau,Jiamusi Mengjiagang Forestry Center,Jiamusi 154000,China)
出处
《森林工程》
2020年第5期34-39,44,共7页
Forest Engineering
基金
国家重点研发项目(2017YFD0600605)。
作者简介
第一作者:张亚伟,硕士研究生。研究方向:森林培育学。E-mail:2457379091@qq.com;通信作者:孙海龙,博士,讲师。研究方向:森林培育学。E-mail:shlong12@126.com。
