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|標題:||Dynamics Changes of Litterfall and Soil Nutrient Content at Different Stands in the Guandaushi
|關鍵字:||litterfall;枯落物;litterbag;soil nutrient pool;土壤養分庫;分解袋||出版社:||森林學系||摘要:||
全年枯落物總量以天然闊葉林枯落物量7,098.9 kg/ha最高，次生闊葉林6,721.5 kg/ha次之，杉木人工林4,659.5 kg/ha最少。枯落物量在月份間有極顯著的差異，約可區分為雙高峰期，一在颱風季節(8-9月)，二在生長季節(3-6月)。枯落物組成成分中以落葉佔最多(52.5-61.2%)，其次為枝(24.3-39.8%)、繁殖體(6.5-14.5%)和其他(1.2-5.8%)。枯落物養份輸入量為天然闊葉林>次生闊葉林>杉木人工林。三種林分全年養份輸入量碳為1.96-2.89 t/ha；氮為49.1-103.3 kg/ha磷為3.89-8.94 kg/ha；鉀為24.67-68.31 kg/ha；鈣為22.91-61.86 kg/ha；鎂為9.12-18.31 kg/ha。
枝葉層養分庫存量除了鎂含量以次生林最高外，其餘養分都是天然林高於次生林、杉木林，其養分含量分別為碳7.73-24.57 t/ha；氮為352.0-1,312.3 kg/ha；磷為51.0-262.6 kg/ha；鉀為289.7-1,736.0 kg/ha；鈣為48.4-407.1 kg/ha；鎂為29.8-124.8 kg/ha。土壤層養分庫存量除了鉀含量以杉木林最高外，其餘也都是天然林高於次生林、杉木林，其養分含量分別為碳110.56-158.96 kg/ha；全氮為4.94-8.06 t/ha；全磷為1.04-2.52 t/ha；鉀為31.97-96.67 kg/ha。土壤層中有效性磷為8.4-92.7 kg/ha；交換性鉀為350.07-451.34 kg/ha；交換性鈣為134.99-481.98 kg/ha；交換性鎂為78.24-98.95 kg/ha。
不同土壤層的溫度變化極為規則，二月份最低，八月最高，在秋冬之際(10月-2月)土壤20 cm深處土壤溫度高於10 cm與地表溫度，但在春季開始則土表層溫度高於10 cm 與20 cm深處土壤溫度。
The monthly amount of litterfall, decomposition rate of litter layer and soil nutrient pool of three different stands (natural hardwood stand, NS; secondary hardwood stand, SS; and China-fir plantation stand, CPS) in the Hui-Sun Experimental Forest were monitored from Sep. 1998 to Aug. 1999 by using littertrap and litterbag approaches respectively. We also used data loggers to collect the temperature in the soil layers.
The results showed that the amount, one yearly basis, of litter of NS (7,098.9 kg/ha) was the highest followed by SS (6,721.5 kg/ha), CPS which amounted to 4,659.5 kg/ha was the lowest. The amounts of litterfall varied significantly with month and indicated that litter productions showed two peaks during one year. One was in typhoon season (Aug.-Sep.), and the other was in growth season (March-Jun.). The litterfall of which 52.5-61.2 % was composed of foliar litter, 24.3-39.8 % was branch, 6.5-14.5 % was reproduction, and the remainder (1.2-5.8 %) was comprised of other plant materials. Annual amounts of these nutrients included 1.96-2.89 t/ha C, 49.1-1.3.3 kg/ha N, 3.89-8.94 kg/ha P, 24.67-68.31 kg/ha K, 22.91-61.86 kg/ha Ca, and 9.12-18.31 kg/ha Mg, respectively. Total nutrient input from litterfall were NS> SS> CPS.
With respect to the decomposition litter collected from NS showed the highest rate during the initial stage (60-254 days), followed by those from SS and CPS. However the rate of litter decomposition collected from CPS became the highest. The mass remaining of litter collected from CPS was 69.5% lower than those from SS (70.52 %) at 254 days, and they were 55.94 %(CPS), 66.54 %(NS), and 61.97 %(SS) at 316 days, respectively. During the study, the trend of the percentages of nutrients remaining of C and Mg increased initially but than decreased, and N and P increased until the study end, and K and Ca decreased initially but than increased.
Nutrient content of litter layers in NS was higher than that in SS and CPS, except that Ca was highest in SS. Litter layer nutrient pool were C: 7.73-24.57 t/ha; N: 352-1,312.3 kg/ha; P: 51-262.6 kg/ha; K: 289.7-1,736 kg/ha; Ca: 48.4-407.1 kg/ha; Mg: 29.8-124.8 kg/ha, respectively. Nutrient content of soil layer in NS was also higher than that in SS and CPS, except that K was highest in CPS. Layer nutrient pool were C: 110.56-158.96 t/ha; total N: 4.94-8.06 t/ha; total P: 1.04-2.52 t/ha; total K: 31.97-96.67 t/ha. The available nutrient exist in soil layer were extractable K: 350.07-451.34 kg/ha; extractable Ca: 134.99-481.98 kg/ha; extractable Mg: 78.24-98.95 kg/ha, respectively。
The fluctuations of soil temperature were regular in different soil layers. The lowest temperature was at Feb. and the highest one was at Aug. During fall to winter (from Oct. to Fed.), the temperature at 20 cm depth was higher than at 10 cm depth and at the surface. But when spring began, the temperature at the surface was higher than 10 and 20 cm depth.
|Appears in Collections:||森林學系|
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