【摘要】 为探明引起新疆乌什县核桃树叶片黄化的主要因素,连续3年(2014—2016)对区域内5个核桃生产园中叶片黄化的植株叶片及土壤中N、P、K、Ca、Mg、Fe、Mn、Cu、Zn 8种矿质营养进行测定,并对核桃叶片叶绿素含量与叶片及土壤矿质营养的相关性进行分析。结果表明,正常植株叶片N、Fe、Mn含量显著高于黄化植株(P<0.01),其中正常植株和黄化植株叶片N含量均低于核桃叶片养分需求的下限值(2.1%);正常植株土壤中有效N、K、Fe含量显著高于黄化植株(P<0.01),黄化植株土壤Fe含量低于植物生长所需土壤适宜范围的下限值(10%);相关分析表明,叶片叶绿素含量与叶片中N、K、Fe、Mn含量和土壤中Fe、Zn含量呈显著(P<0.05)或极显著正相关(P<0.01)。通过上述综合对比分析,初步认为引发乌什县核桃叶片黄化的主要因素是N、Fe元素缺乏。更多还原

【Abstract】 In order to explore the reasons for leaves yellowing of walnut in Xinjiang Wushi county, the experiment was conducted in2014—2016, the five walnut orchard of Wushi county was as study areas, the nutritional elements of nitrogen, phosphorus, potassium,calcium, magnesium, iron, manganese, copper, zinc contents in leaves of normal and yellowing walnut tree and also in their soils were measured, and the relationship between walnut leaf chlorophyll content and soil mineral nutrients was analyzed. The results showed that nitrogen, iron and manganese contents in leaves of the trees with yellowing leaves were significantly lower than those in leaves of the trees with normal leaves respectively(P<0.01). The Nitrogen contents both in normal and yellowing leaves were below the limit of2.1% of walnut. Also the nitrogen, potassium, iron content in soils of the trees with yellowing leaves were significantly lower than that in soils of the trees with normal leaves(P<0.01). Compared with the suitable range of soils nutrition content, the iron content was below the limit of 10%. Correlation analysis indicated that there was significantly positive correlation between chlorophyll content in leaves and leaves nitrogen, potassium, iron, manganese content, and also soil iron, zinc content(P<0.05). According to the above contrastive analysis, it was considered that leaves yellowing of walnut in Wushi county were caused by lack of nitrogen, iron.更多还原