本题目来源于试卷: IB ESS Unit 2: Ecosystems & Ecology，类别为 IB环境系统与社会
[单选题]
State how Net Secondaezw:n:qp 7v3a4jvy606h r mte ry Productivity (NSP) .iqt 3uva( vtey6/u /ccan be calculated.
A. NSP = GPP - R
B. NSP = food eaten - fecal loss
C. NSP = GPP + R
D. NSP = GSP - R
参考答案: D
本题详细解析:
Net secondary productivity = Gross Secondary Productivity – Respiration5cck :-ljit)-u ytjz(lh4e .c
The organisms lose some energy at the secondary level as heat by respiration and therefore NSP is less than GSP.
Option A is wrong because GPP - R will give a value for NPP, net primary productivity, energy or biomass available at the level of the producers for the primary consumers.
Option B is wrong because GSP = food eaten – fecal loss. This is the energy or biomass taken up by consumers from producers before losses due to respiration.
Option C is wrong, net secondary productivity is obtained by removing losses for respiration from gross secondary productivity.
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