Plant Architecture Characteristics Of Haloxylon Ammodendron At Different Ecological Habits In The South Edge Of Gurbantunggut Desert

Haloxylon ammodendron is the constructive species in Gurbantunggut desert, which can adapt to the changing ecology habitat by building different plant architecture characteristics.With the purpose of studying the plant architecture characteristics of Haloxylon ammodendron at different ages and ecology habitats, we choose Karamay, 121 Regimental Farms, 150 Regimental Farms, Fu Kang and Qi Tai as sample plots, taking the old age, the middle age and the young age Haloxylon ammodendron which habitant at the top part, the middle part and the bottom part of plot as the research objects. We study the changing characteristics and the rules in the changing ecology habitat of Haloxylon ammodendron in different ages through the bifurcation rate, branch length, branch angle, branch diameter and the crown/height ratio characteristics. And the results showed:(1)All component indicators of Haloxylon ammodendron changed at different ages, and present intra-species different. The OBR, branch length, branch angle all increased from the young age to the old age; the branch angle varied between35° and 61° from the first grade to the fourth grade, but there’s no difference at different ages. The branch diameter of the middle age was bigger than that of the old age and the young age. Through the observation in the field and the data analysis, we found that the crown/height ratio of a few Haloxylon ammodendron at the old and the middle age were close to 1, more like a irregular sphere. The crown/height ratio of the majority Haloxylon ammodendron were deviated 1, turning out an unequal ellipsoid outlook. It turned out a maximum radius and spread-long ellipsoid outlook at young age. The whole outlook turns out as longitudinal development or horizontal expansion growth pattern, with a lengthen growth pattern at the middle age. what’s more, it present a rush speed lengthen growth pattern in the young age.(2)The component indicators of Haloxylon ammodendron all changed obviously in different ecology habitats, showing obvious environmental difference by rules. With good water condition,such as Qi Tai which near the east and the bottom part, the majority of the Haloxylon ammodendron have more branches, bigger SBR, bigger interspecific density and branch diameter,small OBR, and branch angels, and present an irregular ellipsoid outlook that tends to horizontal expansion. and a spread-out branch architecture characteristics. With advanced light condition,such as Karamay closing to the west and the top part, the most of the Haloxylon ammodendron have logger branch length, bigger branch, bigger OBR, small SBR and RBD and small interspecific density. turned out an irregular ellipsoid outlook which tend to longitudinal development, which proves that the living environment affects Haloxylon ammodendron seriously on the plant architecture characteristics.