Abstract : soil incubation experiments were conducted in lab to delineate the effect of soil temperature and soil water content on soil respirations in broad - leaved / korean pine forest ( mountain dark brown forest soil ), dark coniferous forest ( mountain brown coniferous forest soil ) and erman ' s birch forest ( mountain soddy forest soil ) in changbai mountain in september 2001. the soil water content was adjusted to five different levels ( 9, 21, 30, 37 and 43 ) by adding certain amount of water into the soil cylinders, and the soil sample was incubated at 0, 5, 15, 25 and 35 for 24 h the results indicated that in broad - leaved / korean pine forest the soil respiration rate was positively correlated to soil temperature from 0 to 35. soil respiration rate increased with increase of soil water content within the limits of 21 to 37, while it decreased with soil water content when water content was over the range. the result suggested the interactive effects of temperature and water content on soil respiration. there were significant differences in soil respiration among the various forest types. the soil respiration rate was highest in broad - leaved / korean pine forest, middle in erman ' s birch forest and the lowest in dark coniferous forest. the optimal soil temperature and soil water content for soil respiration was 35 and 37 in broad - leaved / korean pine forest, 25 and 21 in dark coniferous forest, and 35 and 37 in erman ' s birch forest. because the forests of broad - leaved / korean pine, dark coniferous and erman ' s birch are distributed at different altitudes, the soil temperature had 4 - 5 variation in different forest types during the same period. thus, the soil respiration rates measured in brown pine mountain soil were lower than those in dark brown forest and those measured in mountain grass forest soil were higher than those in brown pine mountain soil
文摘:為了研究
土壤溫度和
土壤含水量對闊葉紅松林(山地暗
棕壤) 、雲冷杉暗針葉林(山地
棕針葉林
土壤)和岳樺林(生草森林
土)的
土壤呼吸的影響,於2001年9月在長白山進行了
土壤實驗.利用增加
土壤樣柱的含水量,將
土壤含水量分為9 , 、 21 、 30 、 37和43 5個等級,
土壤樣品分別在0 、 5 、 15 、 25和35的溫度下保持24小時.闊葉紅松林
土壤在0 ( 35范圍內,
土壤呼吸速率與溫度呈正相關.在一定的含水量范圍內( 21 ( 37 ) ,
土壤呼吸隨含水量的增加而升高,當含水量超出該范圍,
土壤呼吸速率則隨含水量的變化而降低.
土壤溫度和水分對
土壤呼吸作用存在明顯的交互作用.不同森林類型
土壤呼吸作用強弱存在顯著差異,大小順序為闊葉紅松林>岳樺林>雲冷杉暗針葉林.紅松闊葉林
土壤呼吸作用的最佳條件是
土壤溫度35 ,含水量37 ;雲冷杉暗針葉林下的山地
棕色針葉
土壤呼吸作用的最佳條件是25 , 21 ;岳樺林
土壤呼吸作用的最佳條件是35 ,含水量37 .但是,由於長白山闊葉紅松林,雲冷杉林和岳樺林處在不同的海拔帶上,同期不同森林類型
土壤溫度各不相同,相差4 ~ 5 ,所以野外所測的同期的山地
棕色針葉林
土呼吸速率應低於暗
棕色森林
土呼吸速率,山地生草森林
土呼吸速率應高於山地
棕色針葉林
土的呼吸速率.圖2表1參25
Soil incubation experiments were conducted in lab to delineate the effect of soil temperature and soil water content on soil respirations in broad - leaved / korean pine forest ( mountain dark brown forest soil ), dark coniferous forest ( mountain brown coniferous forest soil ) and ermans birch forest ( mountain soddy forest soil ) in changbai mountain in september 2001. the soil water content was adjusted to five different levels ( 9, 21, 30, 37 and 43 ) by adding certain amount of water into the soil cylinders, and the soil sample was incubated at 0, 5, 15, 25 and 35 for 24 h the results indicated that in broad - leaved / korean pine forest the soil respiration rate was positively correlated to soil temperature from 0 to 35. soil respiration rate increased with increase of soil water content within the limits of 21 to 37, while it decreased with soil water content when water content was over the range. the result suggested the interactive effects of temperature and water content on soil respiration. there were significant differences in soil respiration among the various forest types. the soil respiration rate was highest in broad - leaved / korean pine forest, middle in ermans birch forest and the lowest in dark coniferous forest. the optimal soil temperature and soil water content for soil respiration was 35 and 37 in broad - leaved / korean pine forest, 25 and 21 in dark coniferous forest, and 35 and 37 in ermans birch forest. because the forests of broad - leaved / korean pine, dark coniferous and ermans birch are distributed at different altitudes, the soil temperature had 4 - 5 variation in different forest types during the same period. thus, the soil respiration rates measured in brown pine mountain soil were lower than those in dark brown forest and those measured in mountain grass forest soil were higher than those in brown pine mountain soil
為了研究
土壤溫度和
土壤含水量對闊葉紅松林(山地暗
棕壤) 、雲冷杉暗針葉林(山地
棕針葉林
土壤)和岳樺林(生草森林
土)的
土壤呼吸的影響,於2001年9月在長白山進行了
土壤實驗.利用增加
土壤樣柱的含水量,將
土壤含水量分為9 , 、 21 、 30 、 37和43 5個等級,
土壤樣品分別在0 、 5 、 15 、 25和35的溫度下保持24小時.闊葉紅松林
土壤在0 ( 35范圍內,
土壤呼吸速率與溫度呈正相關.在一定的含水量范圍內( 21 ( 37 ) ,
土壤呼吸隨含水量的增加而升高,當含水量超出該范圍,
土壤呼吸速率則隨含水量的變化而降低.
土壤溫度和水分對
土壤呼吸作用存在明顯的交互作用.不同森林類型
土壤呼吸作用強弱存在顯著差異,大小順序為闊葉紅松林>岳樺林>雲冷杉暗針葉林.紅松闊葉林
土壤呼吸作用的最佳條件是
土壤溫度35 ,含水量37 ;雲冷杉暗針葉林下的山地
棕色針葉
土壤呼吸作用的最佳條件是25 , 21 ;岳樺林
土壤呼吸作用的最佳條件是35 ,含水量37 .但是,由於長白山闊葉紅松林,雲冷杉林和岳樺林處在不同的海拔帶上,同期不同森林類型
土壤溫度各不相同,相差4 ~ 5 ,所以野外所測的同期的山地
棕色針葉林
土呼吸速率應低於暗
棕色森林
土呼吸速率,山地生草森林
土呼吸速率應高於山地
棕色針葉林
土的呼吸速率.圖2表1參25
Brown fused alumina is made from high quality bauxite by fusing in an electric arc furnace at high temperature
棕剛玉是以優質鋁釩
土為主要原料,在電弧爐內經高溫冶煉而成。
Brown podzolic soil
灰化
棕色
土
Brown desert steppe soil
棕色荒漠草原
土
In their place we found intriguing alternations of turquoise - blue, gray and green clays, brown sandstone and fossilized plant matter called lignite
我們發現取而代之的巖層組成十分有趣,其中包括了藍綠色、灰色、綠色的黏
土、
棕色的沙巖,以及稱做褐煤的植物化石。
While part of this land is later used for highly productive tree crop agriculture ( oil palm, rubber, cocoa ), about 200, 000 ha end up every year as anthropic savanna, dominated by the noxious grass imperata cylindrica ( alang alang )
其中部分
土壤后來開發為生產力較高的經濟樹種農用地(油
棕櫚、橡膠、可可) ,而每年大約20萬公頃則變成受人為活動影響的熱帶稀樹草原,主要由毒草白茅(又名印度白茅)組成。
From the foot to the top of jinfo mountain, the soils appear as yellow soil, dark yellow soil, yellow brown soil and brown soil
土壤分帶性主要表現為:從山下向山頂依次為黃壤、暗黃壤、黃
棕壤和
棕壤。
Grain yield was standy black soil > aquent > cinnamon > brown soil > fluvo - aquic soil, and the cv of grain yield and spikes were large, grain number and 1000 - grain weight were standy
產量表現為砂姜黑
土潮
土褐
土棕壤河潮
土,在不同
土壤類型間產量和穗數變異較大,粒數和千粒重相對穩定。
Studies on population ecology showed that d. versipellis is able to grow on the hillsides of subtropical broadleaf or acicularleaf secondary forest where soil is fertile and the content of n, p, k is high and the ph is 5. 49 - 6. 59
種群生態研究表明八角蓮適宜生長的
土壤為中性偏酸( ph5 . 49 6 . 59 ) 、有機質含量為7 . 34 33 . 33和n 、 p 、 k養分含量高的黃
棕壤;其生長環境的植被為亞熱帶針葉混交林,伴生植物多為當地優勢種。
Noncalcic brown soil
非石灰性
棕色
土
We walk over paw prints, perhaps of a brown hyena that trod here sometime in the past several years when a summer rain turned the surface to mud
我們踏過一些動物的腳印,這可能是幾年前一場夏季豪雨把沙地變成泥地時,一隻棕色土狼恰好經過留下的。