The greenness （SPAD） of uneven-aged leaves of dominant species in the Castanopsis carlessi forest at different altitude gradients in Lingshishan National Forest Park, Fujian Province, China were measured by using po...
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The greenness （SPAD） of uneven-aged leaves of dominant species in the Castanopsis carlessi forest at different altitude gradients in Lingshishan National Forest Park, Fujian Province, China were measured by using portable chlorophyll meter SPAD-502. In addition, the correlation between SPAD value and the concentration of chlorophyll and foliar nitrogen was also investigated. Significant variations in SPAD values were found between the uneven-aged leaves of different dominant species and different altitude gradients. Regression analysis showed that SPAD value was significantly correlated with the concentration of chlorophyll and the content of foliar nitrogen, indicating that SPAD value could be indicators for foliar chlorophyll and nitrogen. It is suggested that SPAD meter is a useful tool for forest assessments in decision-making and operational nutrient management programs.
为探索茶树根际细菌的耐铝和有益生物学特性,从铁观音茶树根际土壤中筛选出3株耐铝细菌T3、T6、TJ3,通过检测菌株分泌植物促生物质的能力、平皿促生试验以及Al（Ⅲ）吸附试验,研究了菌株的植物促生特性和对铝离子的吸附效应。结果表明,本研究从铁观音茶树根际土壤中分离出3株耐铝细菌T3、T6、TJ3,3株茶树根际耐铝细菌显示出较好的植物促生性能,ACC脱氨酶活性在0.090~0.196μM/（mg·min）,IAA分泌量最高达14.93 mg/L,3株菌均显示出固氮能力,菌株T3、T6具有较高的产铁载体能力和溶磷能力。菌株T6、TJ3对小麦种子胚根、胚轴的伸长具有明显的提高作用,菌株T6对小麦种子的发芽率亦显示出促进作用。Al（Ⅲ）吸附试验表明,菌株T6、TJ3比菌株T3具有更强的Al（Ⅲ）吸附能力,在p H 5.0,温度30℃时,吸附平衡时间约为60 min。16S r DNA分子鉴定显示菌株T3、T6、TJ3分别与Burkholderia anthina、Burkholderia cepacia、Pseudomonas fluorescens具有最大序列相似性。可见,筛选出的3株茶树根际细菌具有明显的植物促生作用和耐铝、吸铝效应,具有较好的应用开发前景。
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