摘要
为了探究蓄水坑灌苹果园的合理施肥量,同时为蓄水坑灌条件下苹果树光合模型影响因子的选取提供依据,并为蓄水坑灌下果园水肥高效管理提供参考。设置4个施氮水平,分别为0、150、300和600 kg/hm^2,通过原位试验测试不同施氮水平下,苹果光合速率、气孔导度、叶绿素a、叶绿素b含量及气象参数,并采用相关分析和通径分析对数据进行分析并建立基于关键因素的回归预测方程。结果表明:①蓄水坑灌下叶片光合速率及气孔导度受施氮量影响明显,且均表现为单峰形式,峰值于施氮量300 kg/hm^2时出现。②蓄水坑灌条件下气孔导度、叶绿素a、叶绿素b、施肥量、太阳辐射强度及相对湿度与苹果叶片光合速率为极显著相关,气温与叶片光合速率相关性相对较低。③施肥量与苹果树光合速率、气孔导度、叶绿素a及叶绿素b均为极显著相关;其主要通过影响叶绿素b和气孔导度间接影响叶片光合速率,其间接通径系数分别为0.575和0.547。④蓄水坑灌下,关键因素为气孔导度、叶绿素a和叶绿素b。同时,基于关键因素的光合速率回归方程的预测精度较高。
In order to explore the reasonable fertilizer application rate of apple orchard under water storage pit irrigation,and to provide a basis for the selection of influencing factors of apple tree photosynthesis model and a reference for the efficient management of water and fertilizer under water storage pit irrigation,in this experiment,four nitrogen application levels,namely 0,150,300 and 600 kg/hm^2,were set up,and the photosynthetic rate,stomatal conductivity,chlorophyll a,chlorophyll b content and meteorological parameters were tested by in situ test.The data were analyzed by correlation analysis and path analysis,and the regression prediction equation based on key factors was established.The result shows that:①the photosynthetic rate and stomatal conductance of leaves under water storage pit irrigation were significantly affected by nitrogen application,and both showed a single peak,with the peak occurring at 300 kg/hm^2 nitrogen application.②stomatal conductance,chlorophyll a,chlorophyll b,fertilizer application,solar radiation intensity and relative humidity were significantly correlated with the photosynthetic rate of apple leaves under water storage pit irrigation conditions,while the correlation between air temperature and photosynthetic rate of apple leaves was relatively low.③fertilizer application rate was significantly correlated with photosynthesis rate,stomatal conductance,chlorophyll a and chlorophyll b of apple trees.The photosynthetic rate of leaves was indirectly affected by the influence of chlorophyll b and stomatal conductance,and the through-through coefficient was 0.575 and 0.547,respectively.④under water storage pit irrigation,the key factors are stomatal conductance,chlorophyll a and chlorophyll b.At the same time,the regression equation of photosynthetic rate based on key factors has a high prediction accuracy.
作者
程奇云
马娟娟
任荣
郑利剑
郭向红
孙西欢
CHENG Qi-yun;MA Juan-juan;REN Rong;ZHENG Li-jian;GUO Xiang-hong;SUN Xi-huan(College of Hydraulic Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Jinzhong University, Jinzhong 030619, Shanxi Province, China)
出处
《节水灌溉》
北大核心
2020年第2期37-40,45,共5页
Water Saving Irrigation
基金
国家自然科学基金项目(51579168,51109154)
山西省自然科学基金项目(201601D011053)。
关键词
蓄水坑灌
施氮量
光合速率
影响因子
通径分析
water storage pit irrigation
N application
photosynthetic rate
influence factor
path analysis
