สืบค้นงานวิจัย
RUBBER TREE TRUNK PHLOEM NECROSIS (TPN) IN NORTHEAST THAILAND: 2, WITHIN-STAND CHARACTERISATION OF AFFECTED TREES
Frederic C. Do - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): RUBBER TREE TRUNK PHLOEM NECROSIS (TPN) IN NORTHEAST THAILAND: 2, WITHIN-STAND CHARACTERISATION OF AFFECTED TREES
ผู้แต่ง / หัวหน้าโครงการ (EN): Frederic C. Do
บทคัดย่อ (EN): The main aim of this work was to identify how outbreaks of Trunk Phloem Necrosis (TPN) in rubber trees could originate from environmental stresses. At Satuk, in a dry area in Northeast Thailand, data was collected on tree girth, girth increments and the occurrence of TPN and Tapping Papping Pannel Dryness (TPD) in a young stand of rubber trees (RRIM 600) that had been tapped for three years. For spatial statistics, we used the framework of marked point processes patterns analysis considering diseases as binary marks, and diameters or tree basal area as quantitative marks, and computed second order statistics of the spatial distribution of marks with Monte-Carlo tests using random reallocations of the marks. First of all, a relatively small average girth (49 cm) and slow girth increment (1 cm.yr-1) reflected overall high environmental and exploitation constraints. For a total of 2531 exploitable trees, the incidence of TPN and TPD was 7.6 and 5.9%, respectively. The average girth of TPN trees (52 cm) was significantly larger than that of TPD and health trees (which did not differ significantly from each other). In addition, the girth of healthy trees that were immediate neighbours of TPN trees was significantly smaller than that of other healthy trees. The annual girth increment of TPN trees was larger than that of TPD and healthy trees. This difference likely resulted from the fact tapping had stopped and could partly explain the difference in girth between TPN and healthy trees. The spatial distributions of TPD-affected and TPN-affected trees were not random. Diseased trees frequently formed small clusters of two or three treess (5-10 m radii). Moreover, the clusters of TPN trees were preferentially located within zones of trees with a larger basal area than average, with a maximal distance of aggregation of up to 20 m. This was not the case for TPD trees. From these results, we infer that, prior to disease outbreak, the girth of TPN affected trees is almost systematically equal to or larger than healthy trees. Hence, it seems unlikely that TPN affected trees are individuals exposed to environmental stresses from the earliest developmental stages. Rather, we propose that environmental constraints mainly contribute to the occurrence of TPN through a punctual stress at maturity. The spatial distribution of TPN tree suggests that inter-individual competition is involved in the emergence and extension of the syndrome within the stand. Inter-individual competition may heighten the effects of punctual water stress when a short dry spell occurs during early stages of tapping
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): inter-individual completion
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

การอ้างอิง

Frederic C. Do. "RUBBER TREE TRUNK PHLOEM NECROSIS (TPN) IN NORTHEAST THAILAND: 2, WITHIN-STAND CHARACTERISATION OF AFFECTED TREES". ไม่ระบุหน่วยงาน. ม.ป.ป.

Frederic C. Do. "RUBBER TREE TRUNK PHLOEM NECROSIS (TPN) IN NORTHEAST THAILAND: 2, WITHIN-STAND CHARACTERISATION OF AFFECTED TREES". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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RUBBER TREE TRUNK PHLOEM NECROSIS (TPN) IN NORTHEAST THAILAND: 2, WITHIN-STAND CHARACTERISATION OF AFFECTED TREES
Frederic C. Do
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
RUBBER TREE TRUNK PHLOEM NECROSIS IN NORTHEAST THAILAND: 1-INVESTIGATIONS ON SOIL HETEROGENEITIES AND DISEASE DISTRIBUTION Cloning and Characterization of Specific Molecular Markers of Rubber Tree Trunk Phloem Necrosis Is impeded root growth related to the occurrence of rubber tree Trunk Phloem Necrosis (TPN)? Preliminary results from NE Thailand AQUAPORIN GENES EXPRESSION IN THE TRUNK PHLOEM AND IN THE LATICIFERS OF RUBBER TREE Drought and Trunk Phloem Necrosis (TPN) Effects on Water Status and Xylem Sap Flow of Hevea brasiliensis Towards Understanding Colletotrichum “Species Complexes” Causing Leaf Disease in Rubber Recent advances on biotechnology in rubber tree EVOLUTION OF SOIL FERTILITY AND ITS CORRELATION WITH RUBBER TREE LEAF NUTRITION IN RUBBER PLANTATION Expansion of rubber plantations in Northeast Thailand: Income and living status of full-time hired labors Chemical Control of Chinese Taxillus on Rubber Trees
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