为什么说"食物网"比"食物链"更能解释生态系统为什么稳？
Why does a "food web" explain ecosystem stability better than a "food chain"?
真实世界里物种有多条取食路径，一条断了还能走别的；网络越密，系统抗冲击能力越强，单一链条则脆得像一根线。
Real species have multiple feeding paths, so one break still leaves alternatives; denser webs resist shocks better, while a single chain is fragile as a thread.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Odum & Barrett,《Fundamentals of Ecology》第5版,Brooks/Cole,2004
E. P. Odum and G. W. Barrett, Fundamentals of Ecology, 5th ed., Brooks/Cole, 2004
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL3334843W：Fundamentals of ecology
#食物网 #冗余 #抗冲击
食物链为什么会"越往上越轻"——能量金字塔是什么？
Why does a food chain get "lighter" upward—what is the energy pyramid?
每升一级，约九成能量以热和代谢散失，只剩一成左右传给下一级；所以顶层捕食者总量必然远少于底层植物，呈现底宽顶尖的金字塔。
At each step about 90% of energy is lost as heat and metabolism, leaving ~10% for the next level; top predators are thus far fewer than base plants—a bottom-wide, top-narrow pyramid.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Odum & Barrett,《Fundamentals of Ecology》第5版,Brooks/Cole,2004
E. P. Odum and G. W. Barrett, Fundamentals of Ecology, 5th ed., Brooks/Cole, 2004
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL3334843W：Fundamentals of ecology
#能量金字塔 #十分之一定律 #营养级
为什么"外来捕食者"常比"本地捕食者"破坏更大？
Why do "alien predators" often cause more damage than native ones?
本地猎物没时间演化出应对新捕食者的办法，而外来者可能更高效、没有天敌制衡；于是猎物被快速清空，本地食物网随之紊乱。
Native prey had no time to evolve defenses, and the newcomer may be efficient with no local enemy to check it; prey are quickly wiped out and the native web unravels.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Odum & Barrett,《Fundamentals of Ecology》第5版,Brooks/Cole,2004
E. P. Odum and G. W. Barrett, Fundamentals of Ecology, 5th ed., Brooks/Cole, 2004
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL3334843W：Fundamentals of ecology
#外来捕食者 #演化 #失衡
为什么去掉一个顶级捕食者，整条食物链可能"塌"掉？
Why can removing one top predator collapse a whole food chain?
顶级捕食者压制食草动物数量，一旦消失，食草者暴涨啃光植物、连带动摇整条链；这种自上而下的"级联效应"常被低估。
Top predators cap herbivore numbers; remove them and herbivores explode, strip plants and shake the whole web—a top-down cascade often underestimated.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Odum & Barrett,《Fundamentals of Ecology》第5版,Brooks/Cole,2004
E. P. Odum and G. W. Barrett, Fundamentals of Ecology, 5th ed., Brooks/Cole, 2004
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL3334843W：Fundamentals of ecology
#顶级捕食者 #级联 #失衡
为什么"少吃一环"会让下一环数量暴涨（比如狼—鹿—草）？
Why does "removing one link" make the next link boom (e.g., wolf-deer-grass)?
狼少了鹿就多，鹿多了草就被啃光；捕食者像"刹车"，一旦松开，下游就会失控式增长，这正是食物链相互牵制的体现。
Fewer wolves means more deer, which overgraze grass; predators are the "brake," and releasing it lets the lower link surge—showing how food chains constrain each other.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Odum & Barrett,《Fundamentals of Ecology》第5版,Brooks/Cole,2004
E. P. Odum and G. W. Barrett, Fundamentals of Ecology, 5th ed., Brooks/Cole, 2004
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL3334843W：Fundamentals of ecology
#狼鹿草 #牵制 #刹车