文献类型：期刊文献

英文题名：Macronutrient deficiency in symptoms Betula alnoides seedlings

作者：Chen, L.[1,2] Zeng, J.[1] Xu, D.P.[1] Zhao, Z.G.[1] Guo, J.J.[1]

通信作者：Zeng, J.

机构：[1] Research Institute of Tropical Forestry, Chinese Academy of Forestry, Longdong, Guangzhou 510520, China; [2] Experimental Center of Tropical Forestry, Chinese Academy of Forestry, PingXiang, GuangXi 532600, China

年份：2010

卷号：22

期号：4

起止页码：403-413

外文期刊名：Journal of Tropical Forest Science

收录：EI(收录号：20104913456665);Scopus(收录号：2-s2.0-78649559082)

语种：英文

外文关键词：Chlorophyll - Metabolism - Nutrition

摘要：The decline in seedling quality and production of birch tree (Betula alnoides) is often associated with nutrient stress. Visual foliar symptoms, growth performance, pigment compositions and nutrient interaction of birch seedlings in response to six macronutrient deficiencies were studied. Visual foliar symptoms were most obvious in no nitrogen (-N), no potassium (-K) and no magnesium (-Mg) seedlings but not apparent in no calcium (-Ca) seedlings. Except for -Mg and no sulphur (-S) treatments, seedlings lacking other nutrients showed decreases in most of the growth measurements but an increase in root/shoot ratio. Phosphorous deficiency had no effect on all fractions of pigments, while N and K deficiencies resulted in reductions in chlorophyll-a (chla), chlorophyll-b (chlb), total chlorophyll (chl) and carotenoid (car) but increases in chla/chlb and car/chl ratios. Vector analyses showed that N deficiency not only decreased leaf N concentration but also increased leaf P concentration, possibly because of the antagonism between both ions. Similarly, K, Ca and S deficiencies induced a slight decrease in leaf N concentration that could be explained by a synergism between N and these ions. This kind of nutrient interaction also occurred between P and S in -P seedlings or between Mg and Ca in -Mg seedlings. The findings provided a guideline for diagnosing major macronutrient deficiencies of seedlings. The theoretical foundation for silviculture of B. alnoides will help improve seedling quality and accelerate the sustainable plantation of this species. ? Forest Research Institute Malaysia.