锐齿栎林个体光合器官生长与营养季节动态  

Seasonal variation of growth and nutrient contents for photosynthetic organ of the sharptooth oak stands

作　　者：刘广全[1] 赵士洞[2] 王浩[1] 土小宁[3] 龚立群 

机构地区：[1]中国水利水电科学研究院,北京100044 [2]中国科学院地理科学与资源研究所,北京100101 [3]水利部沙棘开发管理中心,北京100038 [4]西北农林科技大学,杨凌712100

出　　处：《生态学报》2001年第6期883-889,共7页Acta Ecologica Sinica

基　　金：国家重点基础研究发展规划!( G1 9990 4 3 60 2 );中国科学院 95重大研究!( KZ951 -A1 -3 0 1 )

摘　　要：锐齿栎林单叶面积和干重的季节生长呈不同的 S型曲线 ,叶面积叶干重比的季节变化呈不完全 S型。叶从萌动到落叶持续约 1 60 d,展叶第 1周 ,叶重量绝对增长快于叶面积的增加 ,之后相反。叶季节变化表现为叶面积增长迅速且持续时间较短 ,叶重量增加相对缓慢且持续时间较长。刚展叶时 N、P、K含量很高 ,展叶期明显下降 ,落叶前最低 ,Ca含量季节变化则相反 ;Mg含量展叶期较高 ,之后逐渐下降且趋于稳定。叶 N、P、K、Mg间呈显著的正相关 ,前者与 Ca间呈显著的负相关。叶在生长期内具有较高的 N/P、N/K,且其季节变化比单个元素含量更稳定 ;展叶初期 K/Ca很高 ,之后变化逐渐稳定 ;叶 K/Mg的季节变化趋于降低。展叶第 1周叶 N、P、K和 Mg积累量迅速增加 ,继而缓慢增加 ,第 4 5～ 50天达峰值 ,之后逐渐降低 ;Ca积累随叶龄的增加一直处于上升的趋势。叶内 N、P、K、Mg和 Ca积累量与叶的生长发育期有密切的关系。The individual growth and nutrient contents for photosynthetic organ of the sharptooth oak stands in Mt Qinling with seasonal variation have been studied in this paper The individual leaf area and dry matter content of the sharptooth oak stands with seasonal variation followed different S curves, the ratio between leaf area and dry matter followed imperfect S curve The period from budding to fallen leaves of sharptooth oak stands lasted about 160 days, the absolute increment of foliage dry matter in the first week of budding was higher than that of leaf area, and then the other way round The absolute increment of leaf area went faster up and rapider down and sustained shorter period than one of foliage dry matter The percentage contents of N, P, K and Mg in the leaves gradually decreased with foliage age, whereas contents of Ca increased till fallen leaves There are marked positive relations among N, P, K and Mg in leaves, but negative relations between Ca and N, P, K, Mg in the leaves The N/P and N/K went steadily up with foliage age, whereas K/Mg played gradually down, K/Ca was higher at beginning of spreading leaves, and then decreased gradually The nutrient accumulation contents to photosynthetic organ of sharptooth oak stands with seasonal variation followed a partial Normal Function, the accumulation contents of N, P, K and Mg in a leaf went up with foliage age and reached summit at 11 59, 0 56, 5 80 and 0 78mg, then went steadily down, whereas accumulation contents of Ca in a leaf increased gradually and arrived at 6 89mg before fallen leaves The nutrient accumulation contents were influenced by foliage development among the different seasons

关 键 词：锐齿栎林 个体 光合器官 生长 营养元素 季节动态 

分 类 号：Q945[生物学—植物学]