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Effects of grass competition on tree seedlings growth under different light and nutrient availability conditions in tropical dry forests in India
Ecological Research ( IF 1.7 ) Pub Date : 2020-05-18 , DOI: 10.1111/1440-1703.12131
Rahul Bhadouria 1, 2 , Pratap Srivastava 1, 3 , Rishikesh Singh 4 , Sachchidanand Tripathi 5 , Pramit Verma 4 , Akhilesh Singh Raghubanshi 4
Affiliation  

The interactive effects of light, nutrient availability and grass competition on seedlings of four tropical dry forest tree species, namely, Indian jujube (Ziziphus mauritiana), arjun (Terminalia arjuna), gum arabic (Acacia nilotica) and catechu (Acacia catechu), were evaluated in an experimental study at Banaras Hindu University, Varanasi, India. Full‐ and reduced‐ (20% of the full) sunlight, no‐nutrient and nutrient supplementation, and presence of grass and no‐grass conditions were taken in a split‐plot design to observe the effects on the plant growth and leaf nutrient parameters. We observed a significant interaction between light and nutrient availability on total dry weight and relative growth rate for the tree seedlings of all the species. Seedling growth was lower in presence of grass under full sunlight condition with/without nutrient addition, and also under reduced sunlight condition with nutrient addition. However, leaf‐N and ‐P concentration showed slight increase following nutrient addition across the species and light conditions. All the species responded positively to nutrient addition irrespective of light and grass conditions. Our study further indicates that nutrient addition under reduced light condition in tropical dry forests may be a possible strategy to ameliorate the negative impact of grasses on tree seedling growth. Overall, a better understanding of tree seedling establishment in the presence of grasses is of utmost importance for the development of management plans that may improve the diversity of tree species in tropical dry forests.

中文翻译:

印度热带干旱森林中草竞争对不同光照和养分供应条件下树木幼苗生长的影响

光,养分有效性和草竞争对四种热带干林树种的互动影响,分别是印度枣(Zipziphus mauritiana),arjun(Termania arjuna),阿拉伯胶(Acacia nilotica)和catechu(Acacia catechu))在印度瓦拉纳西的Banaras印度大学进行的一项实验研究中进行了评估。在分块设计中采用全日照和减少日照(占日照的20%),无营养和无营养补充以及有草和无草条件的存在,以观察对植物生长和叶片养分参数的影响。我们观察到所有物种的树苗的光和养分利用率,总干重和相对生长率之间存在显着的相互作用。在有/没有添加养分的情况下,在有阳光的条件下有草的情况下,以及在有添加养分的阳光条件下,幼苗的生长都较低。然而,在整个物种和光照条件下,添加营养素后叶片N和P浓度均略有增加。不论光照和草地条件如何,所有物种对营养添加的反应都是积极的。我们的研究进一步表明,在热带干旱森林中,在减少光照的条件下添加养分可能是减轻草对树木幼苗生长的不利影响的一种可行策略。总体而言,更好地了解在有草的情况下树苗的建立对于制定可改善热带干旱森林中树种多样性的管理计划至关重要。
更新日期:2020-05-18
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