Standardized gum tapping techniques to maximize yield from high-value Indian tree,Sterculia urens  

作　　者：Amol Vasishth Vipan Guleria 

机构地区：[1]Department of Forest Products&Utilization,College of Horticulture&Forestry,Jhalrapatan-Jhalawar,Rajasthan 326023,India [2]Regional Horticulture Research&Training Station,Jachh District,Kangra,Himachal Pradesh,India

出　　处：《Journal of Forestry Research》2017年第3期615-619,共5页林业研究（英文版）

基　　金：Department of Science&Technology,Government of Rajasthan(India)

摘　　要：Industrial applications of natural gums have been expanding tremendously, so gum collection from trees provides an important livelihood for local dwellers in drought-prone Rajasthan and its surroundings states. Traditional gum tapping is crude and unscientific; deep incision, untimely extraction and high concentration of chemicals in gum have affected Sterculia urens species in its natural habitat. In studies 2 years on trees having diameter at breast height 〉40 cm from natural stands to maximize gum collection and standardize the tapping method （bore holes vs. V blazes）, tapping season, chemical and concentration, different tapping techniques were tes- ted. For tapping maximum gum was collected using bore hole. Ethephon was better as extraction chemical than sulphuric acid. Bore-hole tapping with a 5-cm hole and ethephon at 300 mg/mL yielded the most gum （135.20 g/ tree）. Ethephon at 300 mg/mL yielded the most gum. Ethephon induced gummosis without affecting the health of tree. Tapping seasons also significantly affected the gum yield; the most gum was obtained in April-June.Industrial applications of natural gums have been expanding tremendously, so gum collection from trees provides an important livelihood for local dwellers in drought-prone Rajasthan and its surroundings states. Traditional gum tapping is crude and unscientific; deep incision, untimely extraction and high concentration of chemicals in gum have affected Sterculia urens species in its natural habitat. In studies 2 years on trees having diameter at breast height 〉40 cm from natural stands to maximize gum collection and standardize the tapping method （bore holes vs. V blazes）, tapping season, chemical and concentration, different tapping techniques were tes- ted. For tapping maximum gum was collected using bore hole. Ethephon was better as extraction chemical than sulphuric acid. Bore-hole tapping with a 5-cm hole and ethephon at 300 mg/mL yielded the most gum （135.20 g/ tree）. Ethephon at 300 mg/mL yielded the most gum. Ethephon induced gummosis without affecting the health of tree. Tapping seasons also significantly affected the gum yield; the most gum was obtained in April-June.

关 键 词：Bore-hole tapping ETHEPHON Natural gum Sterculia urens TAPPING 

分 类 号：S718.4[农业科学—林学]