乾溼交替節水灌溉方法對水稻田稻叢及水域無脊椎動物群集功能多樣性的影響--結果-3 - 農業知識入口網

（三）稻叢特定功能群的物種數與豐量
稻株地上部掃網所得之稻叢稻害者、捕食性天敵、擬寄生性天敵的物種數、豐量在灌溉方法間無一致性變化，但上述三功能群之物種數和豐量在第二期耕作中有增加趨勢，以捕食者個體數與物種數為例，第二期調查的總個體數為5,506隻次，物種數為42種。遠多於第一期之總個體數2,989隻次，物種數28種（表三）。
表三、稻害者、捕食性天敵、擬寄生性天敵的豐量(N) 和物種數(S) 在不同灌溉方法與期作中的變動
Table 3. Fluctuations (S) in individuals and richness (N) of pests, predators and parasitoids between different irrigation methods and crop season.

Sampling units Z		Pest		Predator		Parasitoid
		N	S	N	S	N	S
1st	AWD	1,519	25	349	25	142	17
	CI	1,470	25	366	22	125	14
2nd	AWD	2,979	37	488	28	330	23
	CI	2,527	39	535	33	314	22
1st	Pool	2,989	28	715	29	267	19
2nd	Pool	5,506	42	1,023	36	644	26

^Z 1, noted as first crop season; 2, noted as second crop season; AWD, alternative watering and drying irrigation treatment. CI, conventional irrigation treatment. Pool, pooled the data that count the value of whole crop season.