四湖海岸木麻黃林分生物量及養分量聚集

Accumulation of Stand Biomass and Nutrient Content of Casuarina Plantations in the Suhu Coastal Area

陳財輝(Tsai-Huei Chen) ； 許博行(Bor-Hung Sheu) ； 張峻德(Chun-Te Chang)

《台灣林業科學》 13卷4期 (1998/12) Pp. 335-349

https://doi.org/10.7075/TJFS.199812.0335

摘要

調查雲林縣四湖海岸木麻黃人工林土壤物理性質及1995-1997年間林分生長現況，並以分層取樣法估算林分生物量，之後分析及計算林分養分聚集量。四湖3年生林分為砂土，而9年生林分則為壤質砂土，後者之土壤含水量、細孔隙量及土壤之砏、粘粒含量明顯較高，且其透水速度較低，可看出9年生木麻黃林地土壤性質較佳。四湖3年生23號種源林分葉、枝、幹、根及合計生物量為4.8，8.5，17.3，7.9及35.7ton/ha，各部位比例為12.4:22.7:44.7:20.4，1號種源林分生物量皆較23號種源低；9年生林分葉、枝、幹、根及合計生物量分別為7.4，27.6，63.5，20.8及119.3ton/ha，各部位比例為6.2:23.1:53.2:17.4。可見9年生林分葉量比例較少，而枝、幹量的比例則有增多傾向。氮、磷、鉀、鈣、鎂及鈉等各種養分聚集量，3年生23號種源為566，14.03，52.96，150.61，17.54，77.7kg/ha，3年生1號種源林分養分量皆較23號種源低，而9年生養分量依順為785.2，21.39，230.31，845.08，51.57，147.9kg/ha。四湖3年生林分保持旺盛的生長，且氮年養分增加量以23號種源409.9kg/ha最高，而9年生年養分量則僅增加10. kg/ha。四湖9年生林分已發生競爭，增加量與枯死量相互抵銷，以致林分生物量及養分量聚集不再增加。

關鍵字

木麻黃 ； 海岸防風林 ； 生物量 ； 養分量聚集

並列摘要

Soil physical properties, biomass, and nutrient accumulation of casuarina stands were investigated in the Suhu coastal area of Yunlin county. The soil moisture content, fine porosity component, and silt and day contents were abundant in the 9-yr-old stand, but the water percolation rate had decreased. The total biomass of the 3-yr-old stand (code 23 provenance) was 38.7 ton/ha (4.8, 8.8, 17.3, and 7.9 ton/ha for leaves, branches, stems, and roots, respectively); the biomass of code 1 also 3-yr-old was slightly lower than that of code 23; whereas that of the 9-yr-old stand was 119.3 ton/ha (7.4, 27.6, 63.5, and 20.8 ton/ha for leaves, branches, stems, and roots, respectively). The percentage of total biomass of leaves decreased, whereas the percentages of total biomass of branches and stems increased with casuarina stand growth. The amounts of nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sodium (Na) were 566, 14.03, 52.96, 150.61, 17.54, and 77.7 kg/ha, respectively, in the 3-yr-old stand (code 23); the nutrient contents of code 1 were lower than those of code 23; and amounts were 785.2, 21.39, 230.31, 845.08, 51.57, and 147.9 kg/ha, respectively, in the 9-yr-old stand. The annual nutrient increment in the 3-yr-old stand (code 23) reached 409.9 kg ha^(-1) yr^(-1), whereas that in the 9-yr-old stand was small, with a maximum of 10.7 kg ha^(-1) yr^(-1). There was obvious vigorous growth in the 3-yr-old stands, whereas the 9-yr-old stand was experiencing intense competition; the growth increment was offset by the wither amount, with the result that there was nearly no more increment in stand biomass or nutrient content.

並列關鍵字

casuarina ； coastal windbreaks ； biomass ； nutrient content accumulation