Advancement in field of GIS and Information Technology has taken conservation works and strategies a step further as most conservation works are now dependent on these technologies. The present study explores the pred...Advancement in field of GIS and Information Technology has taken conservation works and strategies a step further as most conservation works are now dependent on these technologies. The present study explores the prediction ability of MAXENT using a very low sample size by applying jackknife analysis over a well defined smaller region and using only climate data. Vanda bicolor is a horticulture important orchid grown in certain patches of North Eastern region of India and the species considered to be “Vulnerable”. Present study reports a distribution prediction model using different geo-climatic parameters for a small area. Model validation by ground truthing gives a significant successful result which clearly defines the ability of MAXENT prediction model to give high success rate (71%) with low training samples. Use of the low sample size over a larger area results in unstable models however application of these samples in smaller radius around the occurrence points could provide good working models.展开更多
Known as the ＂king of spices＂,black pepper（Piper nigrum）,a perennial crop of the tropics,is economically the most important and the most widely used spice crop in the world.To understand its suitable bioclimatic d...Known as the ＂king of spices＂,black pepper（Piper nigrum）,a perennial crop of the tropics,is economically the most important and the most widely used spice crop in the world.To understand its suitable bioclimatic distribution,maximum entropy based on ecological niche modeling was used to model the bioclimatic niches of the species in its Asian range.Based on known occurrences,bioclimatic areas with higher probabilities are mainly located in the eastern and western coasts of the Indian Peninsula,the east of Sumatra Island,some areas in the Malay Archipelago,and the southeast coastal areas of China.Some undocumented places were also predicted as suitable areas.According to the jackknife procedure,the minimum temperature of the coldest month,the mean monthly temperature range,and the precipitation of the wettest month were identified as highly effective factors in the distribution of black pepper and could possibly account for the crop＇s distribution pattern.Such climatic requirements inhibited this species from dispersing and gaining a larger geographical range.展开更多
文摘Advancement in field of GIS and Information Technology has taken conservation works and strategies a step further as most conservation works are now dependent on these technologies. The present study explores the prediction ability of MAXENT using a very low sample size by applying jackknife analysis over a well defined smaller region and using only climate data. Vanda bicolor is a horticulture important orchid grown in certain patches of North Eastern region of India and the species considered to be “Vulnerable”. Present study reports a distribution prediction model using different geo-climatic parameters for a small area. Model validation by ground truthing gives a significant successful result which clearly defines the ability of MAXENT prediction model to give high success rate (71%) with low training samples. Use of the low sample size over a larger area results in unstable models however application of these samples in smaller radius around the occurrence points could provide good working models.
基金founded by Chinese Special Scientific Research Fund for Public Welfare Industry(Agriculture,200903024)the Natural Science Foundation of Hainan Province,China(310071)
文摘Known as the ＂king of spices＂,black pepper（Piper nigrum）,a perennial crop of the tropics,is economically the most important and the most widely used spice crop in the world.To understand its suitable bioclimatic distribution,maximum entropy based on ecological niche modeling was used to model the bioclimatic niches of the species in its Asian range.Based on known occurrences,bioclimatic areas with higher probabilities are mainly located in the eastern and western coasts of the Indian Peninsula,the east of Sumatra Island,some areas in the Malay Archipelago,and the southeast coastal areas of China.Some undocumented places were also predicted as suitable areas.According to the jackknife procedure,the minimum temperature of the coldest month,the mean monthly temperature range,and the precipitation of the wettest month were identified as highly effective factors in the distribution of black pepper and could possibly account for the crop＇s distribution pattern.Such climatic requirements inhibited this species from dispersing and gaining a larger geographical range.
