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Evaluating the Impact of Procneria Orienta Chao’s Injury on Cupressus Funebris Forest’s Health

Author: WenLiang
Tutor: GuoHengXiao;LiuYingGao
School: Sichuan Agricultural University
Course: Forest Protection
Keywords: Cedar forest Parocneria Harm Health assessment
CLC: S763.7
Type: Master's thesis
Year: 2007
Downloads: 31
Quote: 0
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Abstract


Parocneria Sichuan cedar shelterbelts main defoliators occur annually in recent years, the area of ??430 000 ha 2 , a serious threat to the middle and upper reaches of the Yangtze River shelterbelt construction achievements. Kashiwagi Lin Jiankang about Parocneria harm less impact studies, found only in the eighties of the last century, and is limited to the volume of cedar. In this paper, the test plantations survey, cedar the carrier leaf weight with DBH model, the results show that the amount of cedar upload leaf with DBH increases, exponential regression relationship M = ae Bd . Data processing, regression: M = 2323.7261e 0.124455D . On this basis, by artificial Abstract leaf analog Shu Bo gypsy moth forest between hazards research of different leaf picking the strength of the cedar economic health: the establishment of a leaf picking intensity and volume loss of the amount of the model, through different leaf picking strength of Kashiwagi's Determination of the diameter at breast height (D), height (H), and volume (V) Growth Abstract leaves the greater, the smaller the volume growth. Abstract leaves the greater, the smaller the amount of tree height growth. Abstract leaves extent of 60%, 30%, the DBH growth between the amount of 0% (control), no significant difference; Abstract leaves a degree of 90%, 60%, 30%, 0% (control) corresponding to the volume increase with The Duncan method significantly analysis, picking off leaves the extent of 90%, 60%, 30%, 0% (control) corresponds to the amount of volume growth showed a very significant difference. DPS statistical analysis software analysis: a parabolic curve the lost leaf strength (x) and volume growth (Y), regression was: Y = 0.007018-0.000726X-0.005216X 2 . The strength loss leaves (x) with the amount of volume loss (Y ') relationship: Y' = 0.000726X 0.005216X 2 . Analog Parocneria forest hazards to study the impact of different leaf picking intensity on the ecological health of cedar leaf through artificial Abstract: the different leaf picking strength (x) and (Y) canopy interception relational model of quadratic curves: y = ax < sup> 2 bx c. Runoff field set measured under different leaf picking intensity, runoff volume changes, in order to get changes in runoff and sediment Abstract leaf strength (x) and the sediment (Y) the relational model for gradual regression curve: y = a be < sup> cx . The cedar forest landscape health hazards research Parocneria: experiments and other cedar forest area sample survey shows that the hazards Parocneria the cedar canopy scale leaf loss of 30%, will the cedar forest landscape health significantly impact. Use of expert judgment The method Parocneria harm a comprehensive evaluation of the cedar forest timber volume loss, surface runoff, cedar canopy interception, landscape value, a number of indicators, the hazards of Parocneria Kashiwagi Lin Jiankang impact evaluation index, the establishment of the hazards of Parocneria The index of cedar Lin Jiankang I 37.6976%. I said Kashiwagi Lin Jiankang the hazards Parocneria endure the limits of 37.6976%, over 37.6976%, the cedar forest health will be affected. At the same time, I also said the Parocneria harm canopy control index 37.6976% of Parocneria food intake and cedar the carrier leaf consumption model shows that: When the average DBH cedar 8cm, 10cm, 12cm, the 14cm when Parocneria Control Index 565/441 / strains, strain 725 / strains, 930 / strains.

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CLC: > Agricultural Sciences > Forestry > Forest Protection > Forest Pest and Disease Control > All kinds of tree pests and diseases and their prevention
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