Nematode communities in continuous tomato-cropping field soil infested by root-knot nematodes

Figures & data

Table I. Trophic groups, families/genus, c-p value and relative abundance (%) of soil nematodes identified at 0–30 cm soil depth from different continuous cropping greenhouse soil in this study.

Trophic groups	Family or genus	c-p ^a	Duration of continuous cropping (yr)
			0	5	8	10	12
Bacterivores	Acrobeles	2	1.2	0.0	0.0	0.6	0.1
	Acrobeloides	2	0.1	0.0	0.1	0.1	0.0
	Caenorhabditis	1	0.9	0.2	0.4	3.1	0.3
	Cephalobus	2	7.6	0.6	1.5	2.2	0.6
	Cervidellus	2	5.6	0.1	0.1	1.5	0.1
	Chiloplacus	2	6.0	0.8	5.4	2.6	1.0
	Diploseapter	1	8.0	10.0	37.1	27.3	9.6
	Eucephalobus	2	21.5	4.6	1.4	2.6	4.2
	Plectus	2	0.4	-^b	0.0	-	-
	Protorhabditis	1	4.0	16.3	7.9	18.8	7.9
	Rhabditis	1	0.8	0.0	0.1	1.3	0.1
Fungivores	Aphelenchus	2	4.9	2.2	0.3	2.6	0.9
	Aphelenchoides	2	1.0	0.1	0.9	0.2	0.0
Plant parasites	Boleodorus	5	0.8	0.2	0.3	0.6	0.1
	Filenchus	2	1.4	2.0	1.0	0.2	0.1
	Helicotylenchus	2	8.2	56.9	6.3	20.2	1.9
	Longidordae	4	0.1	-	-	-	0.1
	Meloidogyne	2	0.3	0.1	34.4	4.3	57.1
	Pratylenchus	3	2.0	1.8	0.1	8.4	2.5
	Psilenchus	2	4.5	0.0	1.1	0.0	2.0
	Tylenchorhynchus	3	2.0	0.9	0.0	1.2	4.3
	Tylenchus	2	2.2	0.7	0.0	1.2	0.0
Predators-Omnivores	Aporcelaimus	4	10.8	1.5	0.8	0.5	4.6
	Dorylaimidae	4	5.7	0.7	0.7	0.3	2.4
	Gemonhystera	1	0	0.2	0	-	0
	Mononchus	4	0.1	0.2	0	0	0.1
^ac-p value was given according to Bongers (1990). Nematode genera were assigned to the 1–5 ‘colonizer-persister’ c-p scale according to their r and k life-strategy characteristics.
^b-Indicate the nematode species was not observed in the sample.

Figure 1.  Soil nematode populations in different continuous-cropping time soil. The value is a mean from 24 samples. Bar stands for standard deviation.

Figure 2.  Four trophic groups nematodes in soils with different continuous-cropping time and depth. A, Bacterivores; B, Fungivores; C, Plant-parasites; D, Omnivore-predators. The value is a mean from 24 samples. Bar stands for standard deviation.

Figure 3.  Ecological indices of nematodes in soils with different continuous-cropping time and depth. A, Shannon–Wiener index (H); B, Simpson index (D); C, Evenness (J); D, Species richness (SR). Bar stands for standard deviation.

Figure 4.  Maturity index (MI), plant parasite index (PPI), PPI/MI and Nematode channel ratio in soils with different continuous-cropping time and depth. A, Maturity index (MI), B: plant parasite index (PPI), C: PPI/MI, D: Nematode channel ratio (NCR) = B/(B + F) (B, Bacterivores; F, Fungivores) of soil nematodes in different continuous-cropping soil at 0–30 cm soil depth in the study. The value is a mean from 24 samples. Bar stands for standard deviation.