Adaptations of Casuarina Windbreak Stands to Land Subsidence on the Southwestern Coast of Taiwan

本研究以台灣西南海岸地層下陷區木麻黃防風林分為對象，藉由土壤因子，林木外觀形態及林木受害程度觀測等17項指標，利用因素分析之最大變異轉軸法獲得相關轉軸矩陣，進行權重加權因素分析以求林分健康程度值。分析結果共選取出樹冠活力、土壤鹽分、土壤pH值、林木病害、林木開花及根部損傷等6項主要影響因素，顯現於木麻黃防風林之適應差異上。再利用最大變異轉軸法，歸納成林木狀態、樹冠活力及土壤環境等三項影響指標，結果顯示：林分適應特徵受地層下陷之影響，由林木生長、樹冠受害及土壤環境之變化，顯示夏、秋兩季的健康程度較冬、春季下降之季節變動情形。本研究確認台灣西南沿海木麻黃防風林分受到地層下陷之影響，並顯現受災林木適應之特徵及季節變動情形。

關鍵字

地層下陷；木麻黃；防風林分；因素分析

並列摘要

In this study, we investigated the adaptive behavior of Casuarina windbreak stands along the southwestern coast of Taiwan to land subsidence. Based on surveys and measurements of 17 indicators, such as soil factors, the external appearance of individual trees, damage sustained by individual trees etc., we applied a maximum variance reciprocal matrix method of a factorial analysis to obtain sets of reciprocal matrices, together with weighting factor adjustments, and then we derived the state of health of the stands. The analytical results indicated that the vitality of the tree crowns, soil salinity, soil pH, tree diseases, tree flowering, and root damage were the 6 major factors affecting differences in the adaptive performance of Casuarina windbreak stands. Finally, the maximum variance reciprocal matrices of the factorial analysis identified 3 factors of tree status, crown vitality, and changes in the soil environment as influential indicators. Furthermore, the analysis indicated that there was a seasonal fluctuation in the tree health status with a decrease observed in summer and autumn compared to winter and spring. This study confirmed that coastal Casuarina windbreak stands of southwestern Taiwan have already been affected by land subsidence, and the adaptive characteristics of injured trees and a seasonal fluctuation of their health status were observed.

並列關鍵字

land subsidence ； Casuarina sp. ； windbreaks stand ； factorial analysis

國際替代計量

Adaptations of Casuarina Windbreak Stands to Land Subsidence on the Southwestern Coast of Taiwan

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