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Aubreykeys Nude Entire Gallery Of Pictures And Videos 2026

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净初级生产力 (NPP): 是单位时间、单位面积植被利用光合作用产生的有机质物质总量减去植被自身自养呼吸后的有机质量(g/ (m2·a)),可以由林分生物量、林分状况以及林龄的函数关系推算所得。 通过净初级生产量推算的固碳量相当于植物每年的年均固碳量。 净初级生产力(NPP) 是指植物在单位时间单位面积上由光合作用产生的有机物质总量中扣除自养呼吸后的剩余部分,是生产者能用于生长、发育和繁殖的能量值,反映了植物固定和转化光合产物的效率,也是生态系统中其他生物成员生存和繁衍的物质基础。 NPP通常以单位面积和单位时间的净量表示,通常以克碳/平方米/年为单位。 NPP的大小不仅取决于生态系统内生物量的变化,还取决于植物的生长速率、死亡率以及不同生物固定碳的速率。

初级生产力以每天、每平方米有机碳的含量(质量数)来表示。 gC/㎡·a表示每天每平方米有机碳含量的克数。 NPP是指单位面积内一定时间内生态系统初级生产者(如绿色植物)通过光合作用固定的碳元素总量,扣除其自身呼吸消耗后的剩余量。 在双碳(碳中和与碳排放)计算当中,经常会对吸收或者排放的碳 C或二氧化碳 CO₂进行定量表达,比如常用植被NPP(Net Primary Productivity,净初级生产力)来表示植被吸收了多少碳,一般用的单位是gC/m²,进行汇总碳吸收的单位有kg、Tg和Pg等。

它是植物光合作用有机物质的净创造,作为表征陆地生态过程的关键参数,是理解地表碳循环过程不可缺少的部分,是一个估算地球支持能力和评价陆地生态系统可持续发展的一个重要指标。

净初级生产量(NPP, Net Primary Production)指在初级生产过程中,植物光合作用固定的能量中扣除植物呼吸作用消耗掉的那部分,剩下的可用于植物的生长和生殖的能量。 生产量通常用每年每平方米所生产的有机物质干重 [g/ (m2·a)]或每年每平方米所固定能量 [J/ (m2·a)]表示。 我看论文中表示年均npp时,单位有用gc/m2的,也有用gc/ (m2a),但是他们数据范围相同,那这两个单位要怎么使用呢? 然后在计算npp变化速率时,… GPP (gross primary productivity) 总初级生产力.单位时间内生物通过光合作用途径所固定的光合产物量或有机碳总量,又称总第一性生产力或总生态系统生产力 (GEP),是生态系统C循环的基础.

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